Finding the Fourth Proportional to 321.98, 443.98 and 314.43

Step by Step Solution

1. Step 1: Write the proportion equation
   321.98 : 443.98 = 314.43 : x
2. Step 2: Convert to fraction form
   321.98/443.98 = 314.43/x
3. Step 3: Cross multiply
   321.98x = 443.98 × 314.43
4. Step 4: Simplify right side
   321.98x = 139,601.86
5. Step 5: Solve for x
   x = 139,601.86/321.98
6. Step 6: Final answer
   x = 433.58