(3) A proposal to approve the plan of conversion shall be submitted to the members of the mutual holding company. Such plan shall be approved by vote of not less than two-thirds of the votes of the members of the converting mutual holding company voting thereon in person, by proxy or by mail at a meeting of members called for that purpose. Notice stating the date, time and place of the meeting shall be mailed by the mutual holding company to the policyholders of the reorganized insurer at their last known addresses as shown on the records of the reorganizing insurer, except in instances where mailing of notice is not feasible as determined by the commissioner, and notice given to the holder of a policy shall constitute notice to the member of the mutual holding company whose membership arises from the policy. Such notice shall be mailed at least 30 days prior to the meeting. Such notice may be combined with the notice of public hearing as mailed to policyholders pursuant to paragraph (1). Such notice shall be preceded or accompanied by a true and complete copy of the plan, or by a summary thereof approved by the commissioner, and such other explanatory information as the commissioner shall approve or require. Each member entitled to vote on the plan of conversion shall vote by written ballot cast in person or by mail or by proxy agent or agents duly appointed by the member. The commissioner shall have the power to supervise and direct and prescribe the rules governing the procedure for the conduct of voting on the proposal to such extent, consistent with the provisions of sections 19F to 19W, inclusive, as he deems necessary, to insure a fair and accurate vote; such powers shall include, but not be limited to, power to supervise and regulate (i) the determination of members entitled to notice of and to vote on the proposal; (ii) the giving of notice of the proposal; (iii) the receipt, custody, safeguarding, verification and tabulation of proxy forms and ballots; and (iv) the resolution of disputes.