Answer:
vacation wages expense 172,800 debit
  vacation wages payable      172,800 credit
--year-end adjusting entry for vacation cost--
Explanation:
The company will declare a liability for the expected amount. As the current year wages generate benefit to his employees for 172,800. These benefit are an obligation to the company to pay holidays in the following months.
To match the expenses with the time they are generate we also need to declare the vacation expense