Finding the Fourth Proportional to 498.48, 747.72 and 209.73

Step by Step Solution

1. Step 1: Write the proportion equation
   498.48 : 747.72 = 209.73 : x
2. Step 2: Convert to fraction form
   498.48/747.72 = 209.73/x
3. Step 3: Cross multiply
   498.48x = 747.72 × 209.73
4. Step 4: Simplify right side
   498.48x = 156,819.32
5. Step 5: Solve for x
   x = 156,819.32/498.48
6. Step 6: Final answer
   x = 314.60