Finding the Fourth Proportional to 22,761.06, 31,407.15 and 12,688.29

Step by Step Solution

1. Step 1: Write the proportion equation
   22,761.06 : 31,407.15 = 12,688.29 : x
2. Step 2: Convert to fraction form
   22,761.06/31,407.15 = 12,688.29/x
3. Step 3: Cross multiply
   22,761.06x = 31,407.15 × 12,688.29
4. Step 4: Simplify right side
   22,761.06x = 398,503,027.27
5. Step 5: Solve for x
   x = 398,503,027.27/22,761.06
6. Step 6: Final answer
   x = 17,508.10