Finding the Fourth Proportional to 2,635.38, 3,950.88 and 991.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,635.38 : 3,950.88 = 991.02 : x
2. Step 2: Convert to fraction form
   2,635.38/3,950.88 = 991.02/x
3. Step 3: Cross multiply
   2,635.38x = 3,950.88 × 991.02
4. Step 4: Simplify right side
   2,635.38x = 3,915,401.10
5. Step 5: Solve for x
   x = 3,915,401.10/2,635.38
6. Step 6: Final answer
   x = 1,485.71