Finding the Fourth Proportional to 22,760.92, 31,410.20 and 12,689.99

Step by Step Solution

1. Step 1: Write the proportion equation
   22,760.92 : 31,410.20 = 12,689.99 : x
2. Step 2: Convert to fraction form
   22,760.92/31,410.20 = 12,689.99/x
3. Step 3: Cross multiply
   22,760.92x = 31,410.20 × 12,689.99
4. Step 4: Simplify right side
   22,760.92x = 398,595,123.90
5. Step 5: Solve for x
   x = 398,595,123.90/22,760.92
6. Step 6: Final answer
   x = 17,512.26