Finding the Fourth Proportional to 99,661.59, 137,498.49 and 63,871.32

Step by Step Solution

1. Step 1: Write the proportion equation
   99,661.59 : 137,498.49 = 63,871.32 : x
2. Step 2: Convert to fraction form
   99,661.59/137,498.49 = 63,871.32/x
3. Step 3: Cross multiply
   99,661.59x = 137,498.49 × 63,871.32
4. Step 4: Simplify right side
   99,661.59x = 8,782,210,054.31
5. Step 5: Solve for x
   x = 8,782,210,054.31/99,661.59
6. Step 6: Final answer
   x = 88,120.31