Finding the Fourth Proportional to 498.48, 687.81 and 458.15

Step by Step Solution

1. Step 1: Write the proportion equation
   498.48 : 687.81 = 458.15 : x
2. Step 2: Convert to fraction form
   498.48/687.81 = 458.15/x
3. Step 3: Cross multiply
   498.48x = 687.81 × 458.15
4. Step 4: Simplify right side
   498.48x = 315,120.15
5. Step 5: Solve for x
   x = 315,120.15/498.48
6. Step 6: Final answer
   x = 632.17