Finding the Fourth Proportional to 90,401.64, 135,425.94 and 42,949.20

Step by Step Solution

1. Step 1: Write the proportion equation
   90,401.64 : 135,425.94 = 42,949.20 : x
2. Step 2: Convert to fraction form
   90,401.64/135,425.94 = 42,949.20/x
3. Step 3: Cross multiply
   90,401.64x = 135,425.94 × 42,949.20
4. Step 4: Simplify right side
   90,401.64x = 5,816,435,782.25
5. Step 5: Solve for x
   x = 5,816,435,782.25/90,401.64
6. Step 6: Final answer
   x = 64,339.94