Finding the Fourth Proportional to 90,359.58, 135,540.46 and 42,979.72

Step by Step Solution

1. Step 1: Write the proportion equation
   90,359.58 : 135,540.46 = 42,979.72 : x
2. Step 2: Convert to fraction form
   90,359.58/135,540.46 = 42,979.72/x
3. Step 3: Cross multiply
   90,359.58x = 135,540.46 × 42,979.72
4. Step 4: Simplify right side
   90,359.58x = 5,825,491,019.47
5. Step 5: Solve for x
   x = 5,825,491,019.47/90,359.58
6. Step 6: Final answer
   x = 64,470.10