Finding the Fourth Proportional to 22,759.92, 31,408.82 and 12,689

Step by Step Solution

1. Step 1: Write the proportion equation
   22,759.92 : 31,408.82 = 12,689 : x
2. Step 2: Convert to fraction form
   22,759.92/31,408.82 = 12,689/x
3. Step 3: Cross multiply
   22,759.92x = 31,408.82 × 12,689
4. Step 4: Simplify right side
   22,759.92x = 398,546,516.98
5. Step 5: Solve for x
   x = 398,546,516.98/22,759.92
6. Step 6: Final answer
   x = 17,510.89