Finding the Fourth Proportional to 498.50, 742.80 and 443.98

Step by Step Solution

1. Step 1: Write the proportion equation
   498.50 : 742.80 = 443.98 : x
2. Step 2: Convert to fraction form
   498.50/742.80 = 443.98/x
3. Step 3: Cross multiply
   498.50x = 742.80 × 443.98
4. Step 4: Simplify right side
   498.50x = 329,782.41
5. Step 5: Solve for x
   x = 329,782.41/498.50
6. Step 6: Final answer
   x = 661.55