Finding the Fourth Proportional to 321.10, 443.10 and 196.73

Step by Step Solution

1. Step 1: Write the proportion equation
   321.10 : 443.10 = 196.73 : x
2. Step 2: Convert to fraction form
   321.10/443.10 = 196.73/x
3. Step 3: Cross multiply
   321.10x = 443.10 × 196.73
4. Step 4: Simplify right side
   321.10x = 87,171.25
5. Step 5: Solve for x
   x = 87,171.25/321.10
6. Step 6: Final answer
   x = 271.48