Finding the Fourth Proportional to 22,760.29, 31,409.22 and 12,688.53

Step by Step Solution

1. Step 1: Write the proportion equation
   22,760.29 : 31,409.22 = 12,688.53 : x
2. Step 2: Convert to fraction form
   22,760.29/31,409.22 = 12,688.53/x
3. Step 3: Cross multiply
   22,760.29x = 31,409.22 × 12,688.53
4. Step 4: Simplify right side
   22,760.29x = 398,536,839.24
5. Step 5: Solve for x
   x = 398,536,839.24/22,760.29
6. Step 6: Final answer
   x = 17,510.18