Finding the Fourth Proportional to 90,375.59, 135,591.73 and 54,391.31

Step by Step Solution

1. Step 1: Write the proportion equation
   90,375.59 : 135,591.73 = 54,391.31 : x
2. Step 2: Convert to fraction form
   90,375.59/135,591.73 = 54,391.31/x
3. Step 3: Cross multiply
   90,375.59x = 135,591.73 × 54,391.31
4. Step 4: Simplify right side
   90,375.59x = 7,375,011,514.40
5. Step 5: Solve for x
   x = 7,375,011,514.40/90,375.59
6. Step 6: Final answer
   x = 81,604.02