Finding the Fourth Proportional to 321.05, 443.04 and 196.72

Step by Step Solution

1. Step 1: Write the proportion equation
   321.05 : 443.04 = 196.72 : x
2. Step 2: Convert to fraction form
   321.05/443.04 = 196.72/x
3. Step 3: Cross multiply
   321.05x = 443.04 × 196.72
4. Step 4: Simplify right side
   321.05x = 87,154.83
5. Step 5: Solve for x
   x = 87,154.83/321.05
6. Step 6: Final answer
   x = 271.47