Finding the Fourth Proportional to 99,451.18, 137,291.52 and 77,902.55

Step by Step Solution

1. Step 1: Write the proportion equation
   99,451.18 : 137,291.52 = 77,902.55 : x
2. Step 2: Convert to fraction form
   99,451.18/137,291.52 = 77,902.55/x
3. Step 3: Cross multiply
   99,451.18x = 137,291.52 × 77,902.55
4. Step 4: Simplify right side
   99,451.18x = 10,695,359,501.38
5. Step 5: Solve for x
   x = 10,695,359,501.38/99,451.18
6. Step 6: Final answer
   x = 107,543.82