Finding the Fourth Proportional to 498.18, 687.78 and 443.52

Step by Step Solution

1. Step 1: Write the proportion equation
   498.18 : 687.78 = 443.52 : x
2. Step 2: Convert to fraction form
   498.18/687.78 = 443.52/x
3. Step 3: Cross multiply
   498.18x = 687.78 × 443.52
4. Step 4: Simplify right side
   498.18x = 305,044.19
5. Step 5: Solve for x
   x = 305,044.19/498.18
6. Step 6: Final answer
   x = 612.32