To round 5090.909091 to the nearest whole number, follow these steps:
Identify the decimal part: In the number 5090.909091, the first digit after the decimal point is 9.
Apply rounding rules: Since the first digit after the decimal point (9) is greater than or equal to 5, you round the number up by 1.
Final rounded result: The number becomes 5091.
Thus, 5090.909091 rounded to the nearest whole number is 5091.