Answer:
Given that,
At the end of the current year,
$17,555 of fees have been earned but have not been billed to clients.
The Journal entry is as follows:
Account receivable A/c Dr. $17,555
To Fees earned A/c $17,555
(To record the accrued fees)
The above is the adjusting entry for the accrued fees that has not been billed to clients.