Finding the Fourth Proportional to 22,572.18, 31,151.16 and 13,140.78

Step by Step Solution

1. Step 1: Write the proportion equation
   22,572.18 : 31,151.16 = 13,140.78 : x
2. Step 2: Convert to fraction form
   22,572.18/31,151.16 = 13,140.78/x
3. Step 3: Cross multiply
   22,572.18x = 31,151.16 × 13,140.78
4. Step 4: Simplify right side
   22,572.18x = 409,350,540.30
5. Step 5: Solve for x
   x = 409,350,540.30/22,572.18
6. Step 6: Final answer
   x = 18,135.18