Finding the Fourth Proportional to 90,451.48, 135,697.89 and 31,287.10

Step by Step Solution

1. Step 1: Write the proportion equation
   90,451.48 : 135,697.89 = 31,287.10 : x
2. Step 2: Convert to fraction form
   90,451.48/135,697.89 = 31,287.10/x
3. Step 3: Cross multiply
   90,451.48x = 135,697.89 × 31,287.10
4. Step 4: Simplify right side
   90,451.48x = 4,245,593,454.22
5. Step 5: Solve for x
   x = 4,245,593,454.22/90,451.48
6. Step 6: Final answer
   x = 46,937.80