Finding the Fourth Proportional to 99,781.86, 137,701.80 and 54,462.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,781.86 : 137,701.80 = 54,462.72 : x
2. Step 2: Convert to fraction form
   99,781.86/137,701.80 = 54,462.72/x
3. Step 3: Cross multiply
   99,781.86x = 137,701.80 × 54,462.72
4. Step 4: Simplify right side
   99,781.86x = 7,499,614,576.90
5. Step 5: Solve for x
   x = 7,499,614,576.90/99,781.86
6. Step 6: Final answer
   x = 75,160.10