Finding the Fourth Proportional to 498.72, 748 and 133.56

Step by Step Solution

1. Step 1: Write the proportion equation
   498.72 : 748 = 133.56 : x
2. Step 2: Convert to fraction form
   498.72/748 = 133.56/x
3. Step 3: Cross multiply
   498.72x = 748 × 133.56
4. Step 4: Simplify right side
   498.72x = 99,902.88
5. Step 5: Solve for x
   x = 99,902.88/498.72
6. Step 6: Final answer
   x = 200.32