Finding the Fourth Proportional to 99,543.89, 137,370.54 and 54,831.89

Step by Step Solution

1. Step 1: Write the proportion equation
   99,543.89 : 137,370.54 = 54,831.89 : x
2. Step 2: Convert to fraction form
   99,543.89/137,370.54 = 54,831.89/x
3. Step 3: Cross multiply
   99,543.89x = 137,370.54 × 54,831.89
4. Step 4: Simplify right side
   99,543.89x = 7,532,286,338.52
5. Step 5: Solve for x
   x = 7,532,286,338.52/99,543.89
6. Step 6: Final answer
   x = 75,667.99