Finding the Fourth Proportional to 22,565.50, 31,140.42 and 12,629.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,565.50 : 31,140.42 = 12,629.50 : x
2. Step 2: Convert to fraction form
   22,565.50/31,140.42 = 12,629.50/x
3. Step 3: Cross multiply
   22,565.50x = 31,140.42 × 12,629.50
4. Step 4: Simplify right side
   22,565.50x = 393,287,934.39
5. Step 5: Solve for x
   x = 393,287,934.39/22,565.50
6. Step 6: Final answer
   x = 17,428.73