Finding the Fourth Proportional to 99,488.29, 137,306.24 and 56,481.70

Step by Step Solution

1. Step 1: Write the proportion equation
   99,488.29 : 137,306.24 = 56,481.70 : x
2. Step 2: Convert to fraction form
   99,488.29/137,306.24 = 56,481.70/x
3. Step 3: Cross multiply
   99,488.29x = 137,306.24 × 56,481.70
4. Step 4: Simplify right side
   99,488.29x = 7,755,290,017.10
5. Step 5: Solve for x
   x = 7,755,290,017.10/99,488.29
6. Step 6: Final answer
   x = 77,951.79