If the board of supervisors finds that protest has been made prior to its final determination for formation of the district, by the owners of land, or by the owners of real property in the event of the applicability of the provisions of Section 74056, within the proposed district the assessed value of which, as shown by the last equalized assessment roll, constitutes more than one-half of the total assessed value of the land or real property, as the case may be, within the proposed district, the proceeding shall terminate. The board of supervisors shall order the proceeding terminated when such protests are received.