Finding the Fourth Proportional to 99,687.49, 137,490.98 and 63,880.83

Step by Step Solution

1. Step 1: Write the proportion equation
   99,687.49 : 137,490.98 = 63,880.83 : x
2. Step 2: Convert to fraction form
   99,687.49/137,490.98 = 63,880.83/x
3. Step 3: Cross multiply
   99,687.49x = 137,490.98 × 63,880.83
4. Step 4: Simplify right side
   99,687.49x = 8,783,037,600.51
5. Step 5: Solve for x
   x = 8,783,037,600.51/99,687.49
6. Step 6: Final answer
   x = 88,105.72