Finding the Fourth Proportional to 98,640.50, 136,132.18 and 60,399.86

Step by Step Solution

1. Step 1: Write the proportion equation
   98,640.50 : 136,132.18 = 60,399.86 : x
2. Step 2: Convert to fraction form
   98,640.50/136,132.18 = 60,399.86/x
3. Step 3: Cross multiply
   98,640.50x = 136,132.18 × 60,399.86
4. Step 4: Simplify right side
   98,640.50x = 8,222,363,781.83
5. Step 5: Solve for x
   x = 8,222,363,781.83/98,640.50
6. Step 6: Final answer
   x = 83,356.88