Finding the Fourth Proportional to 498.88, 688 and 323.92

Step by Step Solution

1. Step 1: Write the proportion equation
   498.88 : 688 = 323.92 : x
2. Step 2: Convert to fraction form
   498.88/688 = 323.92/x
3. Step 3: Cross multiply
   498.88x = 688 × 323.92
4. Step 4: Simplify right side
   498.88x = 222,856.96
5. Step 5: Solve for x
   x = 222,856.96/498.88
6. Step 6: Final answer
   x = 446.71