The allocation of voting rights among affected landowners on the question of establishing a proposed project must provide a fair relationship between the amount of liability for assessments and the power of objecting to the establishment of the project. Affected landowners have one vote for each dollar of assessment to which the land is subject or one vote for each dollar of the assessed valuation of land condemned for the project, as determined in accordance with title 57. The governing body of any county, township, or city to be assessed also has one vote for each dollar of assessment against the county, township, or city. There may be only one vote for each dollar of assessment, regardless of the number of owners of a tract of land. If there is more than one owner of the land, the votes must be prorated among the owners in accordance with each owner’s property interest. A written power of attorney authorizes an agent to protest a project on behalf of the affected landowner that executed the power of attorney.