Finding the Fourth Proportional to 99,778.91, 137,693.82 and 54,456.53

Step by Step Solution

1. Step 1: Write the proportion equation
   99,778.91 : 137,693.82 = 54,456.53 : x
2. Step 2: Convert to fraction form
   99,778.91/137,693.82 = 54,456.53/x
3. Step 3: Cross multiply
   99,778.91x = 137,693.82 × 54,456.53
4. Step 4: Simplify right side
   99,778.91x = 7,498,327,542.65
5. Step 5: Solve for x
   x = 7,498,327,542.65/99,778.91
6. Step 6: Final answer
   x = 75,149.42