Finding the Fourth Proportional to 99,291.88, 137,088.77 and 76,280.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,291.88 : 137,088.77 = 76,280.72 : x
2. Step 2: Convert to fraction form
   99,291.88/137,088.77 = 76,280.72/x
3. Step 3: Cross multiply
   99,291.88x = 137,088.77 × 76,280.72
4. Step 4: Simplify right side
   99,291.88x = 10,457,229,720.55
5. Step 5: Solve for x
   x = 10,457,229,720.55/99,291.88
6. Step 6: Final answer
   x = 105,318.08