Finding the Fourth Proportional to 22,758.71, 31,407.98 and 12,687.14

Step by Step Solution

1. Step 1: Write the proportion equation
   22,758.71 : 31,407.98 = 12,687.14 : x
2. Step 2: Convert to fraction form
   22,758.71/31,407.98 = 12,687.14/x
3. Step 3: Cross multiply
   22,758.71x = 31,407.98 × 12,687.14
4. Step 4: Simplify right side
   22,758.71x = 398,477,218.90
5. Step 5: Solve for x
   x = 398,477,218.90/22,758.71
6. Step 6: Final answer
   x = 17,508.78