That at the time set for the hearing of the petition, as provided in the next preceding section, it shall be the duty of the county commissioners to first ascertain and determine whether notice of the time of hearing as required by this act has been given, and, if it shall be determined that such notice has been given, to make a declaration and finding of that fact and cause same to be entered upon its records, and thereupon to hear all persons in favor or opposed to granting the prayer of said petition and all other evidence that it may desire to hear for the purpose of ascertaining whether such petition contains the proper numbers of signers possessing the qualifications prescribed by this act, and whether the statements in said petition are true; and if upon hearing of evidence it shall be found that such petition is in conformity to the requirements of this act, and that the allegations thereof are true, then such board of county commissioners shall make a finding and decision to that effect. Thereupon, the board of county commissioners shall determine whether the formation of such improvement district would be in the best interests of the county. If the board of county commissioners determines that it would be in the best interests of the county it shall so find, and shall thereupon immediately declare the territory described in the petition to constitute a public corporation, and the inhabitants within such bounds or the owners of the property described to be incorporated as an improvement district under the name of “the _____________ improvement district, _____________ county, Kansas.” (inserting the name designated in the petition and the name of the proper county), and thenceforth the said territory and the inhabitants residing therein or the owners of the property described and their successors shall constitute a body politic and corporate under said corporate name, and shall have perpetual succession.