Finding the Fourth Proportional to 498.05, 686.37 and 357.92

Step by Step Solution

1. Step 1: Write the proportion equation
   498.05 : 686.37 = 357.92 : x
2. Step 2: Convert to fraction form
   498.05/686.37 = 357.92/x
3. Step 3: Cross multiply
   498.05x = 686.37 × 357.92
4. Step 4: Simplify right side
   498.05x = 245,665.55
5. Step 5: Solve for x
   x = 245,665.55/498.05
6. Step 6: Final answer
   x = 493.25