Finding the Fourth Proportional to 328.86, 453.89 and 196.09

Step by Step Solution

1. Step 1: Write the proportion equation
   328.86 : 453.89 = 196.09 : x
2. Step 2: Convert to fraction form
   328.86/453.89 = 196.09/x
3. Step 3: Cross multiply
   328.86x = 453.89 × 196.09
4. Step 4: Simplify right side
   328.86x = 89,003.61
5. Step 5: Solve for x
   x = 89,003.61/328.86
6. Step 6: Final answer
   x = 270.64