Final answer:
The approval of operating instructions establishing procedures for the use of imprest funds is typically done by the executive authority within an organization.
Step-by-step explanation:
Operating instructions (OI) establishing procedures for the use of imprest funds are typically approved by the executive authority within an organization. This authority may vary depending on the specific organizational structure, but in most cases, it is the person or group responsible for financial management and oversight.
For example, in a company, the Chief Financial Officer (CFO) or the finance department would usually be responsible for approving the OI for imprest funds. In a government agency, it could be the finance or budget department.
The approval process ensures that there is proper accountability and control over the use of imprest funds, which are usually small cash funds maintained for petty cash expenses.