Finding the Fourth Proportional to 498.31, 746.90 and 238.10

Step by Step Solution

1. Step 1: Write the proportion equation
   498.31 : 746.90 = 238.10 : x
2. Step 2: Convert to fraction form
   498.31/746.90 = 238.10/x
3. Step 3: Cross multiply
   498.31x = 746.90 × 238.10
4. Step 4: Simplify right side
   498.31x = 177,836.89
5. Step 5: Solve for x
   x = 177,836.89/498.31
6. Step 6: Final answer
   x = 356.88