Finding the Fourth Proportional to 102,638.70, 141,680.25 and 88,240.86

Step by Step Solution

1. Step 1: Write the proportion equation
   102,638.70 : 141,680.25 = 88,240.86 : x
2. Step 2: Convert to fraction form
   102,638.70/141,680.25 = 88,240.86/x
3. Step 3: Cross multiply
   102,638.70x = 141,680.25 × 88,240.86
4. Step 4: Simplify right side
   102,638.70x = 12,501,987,105.02
5. Step 5: Solve for x
   x = 12,501,987,105.02/102,638.70
6. Step 6: Final answer
   x = 121,805.78