Finding the Fourth Proportional to 105,689.92, 145,767.38 and 92,915.96

Step by Step Solution

1. Step 1: Write the proportion equation
   105,689.92 : 145,767.38 = 92,915.96 : x
2. Step 2: Convert to fraction form
   105,689.92/145,767.38 = 92,915.96/x
3. Step 3: Cross multiply
   105,689.92x = 145,767.38 × 92,915.96
4. Step 4: Simplify right side
   105,689.92x = 13,544,116,049.38
5. Step 5: Solve for x
   x = 13,544,116,049.38/105,689.92
6. Step 6: Final answer
   x = 128,149.55