Finding the Fourth Proportional to 99,499.20, 137,309.84 and 57,049.52

Step by Step Solution

1. Step 1: Write the proportion equation
   99,499.20 : 137,309.84 = 57,049.52 : x
2. Step 2: Convert to fraction form
   99,499.20/137,309.84 = 57,049.52/x
3. Step 3: Cross multiply
   99,499.20x = 137,309.84 × 57,049.52
4. Step 4: Simplify right side
   99,499.20x = 7,833,460,463.28
5. Step 5: Solve for x
   x = 7,833,460,463.28/99,499.20
6. Step 6: Final answer
   x = 78,728.88