Finding the Fourth Proportional to 22,760.88, 31,406.94 and 12,688.83

Step by Step Solution

1. Step 1: Write the proportion equation
   22,760.88 : 31,406.94 = 12,688.83 : x
2. Step 2: Convert to fraction form
   22,760.88/31,406.94 = 12,688.83/x
3. Step 3: Cross multiply
   22,760.88x = 31,406.94 × 12,688.83
4. Step 4: Simplify right side
   22,760.88x = 398,517,322.48
5. Step 5: Solve for x
   x = 398,517,322.48/22,760.88
6. Step 6: Final answer
   x = 17,508.87