Finding the Fourth Proportional to 22,761.41, 31,410.18 and 12,689.81

Step by Step Solution

1. Step 1: Write the proportion equation
   22,761.41 : 31,410.18 = 12,689.81 : x
2. Step 2: Convert to fraction form
   22,761.41/31,410.18 = 12,689.81/x
3. Step 3: Cross multiply
   22,761.41x = 31,410.18 × 12,689.81
4. Step 4: Simplify right side
   22,761.41x = 398,589,353.69
5. Step 5: Solve for x
   x = 398,589,353.69/22,761.41
6. Step 6: Final answer
   x = 17,511.63