Finding the Fourth Proportional to 22,761.88, 31,408.32 and 12,689.83

Step by Step Solution

1. Step 1: Write the proportion equation
   22,761.88 : 31,408.32 = 12,689.83 : x
2. Step 2: Convert to fraction form
   22,761.88/31,408.32 = 12,689.83/x
3. Step 3: Cross multiply
   22,761.88x = 31,408.32 × 12,689.83
4. Step 4: Simplify right side
   22,761.88x = 398,566,241.39
5. Step 5: Solve for x
   x = 398,566,241.39/22,761.88
6. Step 6: Final answer
   x = 17,510.25