Finding the Fourth Proportional to 99,831.30, 137,766.15 and 54,509.15

Step by Step Solution

1. Step 1: Write the proportion equation
   99,831.30 : 137,766.15 = 54,509.15 : x
2. Step 2: Convert to fraction form
   99,831.30/137,766.15 = 54,509.15/x
3. Step 3: Cross multiply
   99,831.30x = 137,766.15 × 54,509.15
4. Step 4: Simplify right side
   99,831.30x = 7,509,515,735.27
5. Step 5: Solve for x
   x = 7,509,515,735.27/99,831.30
6. Step 6: Final answer
   x = 75,222.06