Finding the Fourth Proportional to 321.09, 443.01 and 196.69

Step by Step Solution

1. Step 1: Write the proportion equation
   321.09 : 443.01 = 196.69 : x
2. Step 2: Convert to fraction form
   321.09/443.01 = 196.69/x
3. Step 3: Cross multiply
   321.09x = 443.01 × 196.69
4. Step 4: Simplify right side
   321.09x = 87,135.82
5. Step 5: Solve for x
   x = 87,135.82/321.09
6. Step 6: Final answer
   x = 271.37