Finding the Fourth Proportional to 99,543.88, 137,370.56 and 54,831.88

Step by Step Solution

1. Step 1: Write the proportion equation
   99,543.88 : 137,370.56 = 54,831.88 : x
2. Step 2: Convert to fraction form
   99,543.88/137,370.56 = 54,831.88/x
3. Step 3: Cross multiply
   99,543.88x = 137,370.56 × 54,831.88
4. Step 4: Simplify right side
   99,543.88x = 7,532,286,061.45
5. Step 5: Solve for x
   x = 7,532,286,061.45/99,543.88
6. Step 6: Final answer
   x = 75,668.00