The county auditor of each county of the first class not having a charter form of government and of each county of the second class shall set up and follow an accounting system in his office which shall comply with the following requirements: A double entry accounting system shall be provided. The system shall provide for each fund, appropriate accounts to record and classify the property, resources, and liabilities of the county; to record and classify the receipts for the fiscal period by sources or kind, and to record and classify the expenditures for the fiscal period according to the purpose and object for which incurred, and in such detail as to be conveniently comparable with budget appropriations for each purpose or object. Such accounting system shall be kept currently up to date, shall be in permanent form and shall be so established as to facilitate inspection and examination of county financial affairs. Such accounting system shall include and reflect accurately, in appropriate form, the current reports required of all officers of such county as provided in sections 55.190 to 55.270. The auditor in prescribing and setting up such accounting system shall adhere to the requirements herein set out for such a system as nearly as may be compatible with the makeup and provisions of each fund of such county, the budget system prescribed by statute for such county, and the otherwise applicable laws applying to such county. In any such county, the auditor shall install such accounting system in his office so that it shall be in operation and effect as soon as practicable. The county commission shall make provision for the cost of installing any such system, and in any such county it shall not be necessary for the auditor to obtain approval of the county commission before installing same as otherwise provided by section 55.160; except that the costs of installation of such system shall be subject to the approval of the county commission.