Finding the Fourth Proportional to 99,861.72, 137,809.98 and 55,149.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,861.72 : 137,809.98 = 55,149.72 : x
2. Step 2: Convert to fraction form
   99,861.72/137,809.98 = 55,149.72/x
3. Step 3: Cross multiply
   99,861.72x = 137,809.98 × 55,149.72
4. Step 4: Simplify right side
   99,861.72x = 7,600,181,810.21
5. Step 5: Solve for x
   x = 7,600,181,810.21/99,861.72
6. Step 6: Final answer
   x = 76,107.06