Per Capita Calculation

Dear All,

I need help with the DAX measure to calculate the Per Capita Amount for employees.
Let's consider Employee A who is present in 2021 for 3 months. In 2021 we have maximum month number 12. So Average people would be 3/12 = 0.25
For Employee B he is present in 2022 for 6 months. So in 2022, we have maximum month in our dataset is 12. So Average people would be 6/12 = 0.5
For Employee C he is present in 2022 for 2 months and maximum month available for 20222 is 12. So Average people would be 2/12 = 0.125
Again Employee C is present in 2023 for 1 month. This time we have maximum month available for 2023 is 8 since we have data till 2023, August. So Average people would be 1/8 = 0.125
Total Per Capita Amount would be sum of amount which is 474,269 and sum of Average people which is 1.035. Then we have to divide 474,269/1.035 = 458,230.91

Sample data:

Payroll INC           Period          YearMonth    Year             Month               Emp Name       Emp ID           Emp Type       Amount    Paycode