Finding the Fourth Proportional to 99,648.56, 137,520.48 and 57,209.83

Step by Step Solution

1. Step 1: Write the proportion equation
   99,648.56 : 137,520.48 = 57,209.83 : x
2. Step 2: Convert to fraction form
   99,648.56/137,520.48 = 57,209.83/x
3. Step 3: Cross multiply
   99,648.56x = 137,520.48 × 57,209.83
4. Step 4: Simplify right side
   99,648.56x = 7,867,523,153.05
5. Step 5: Solve for x
   x = 7,867,523,153.05/99,648.56
6. Step 6: Final answer
   x = 78,952.70