Finding the Fourth Proportional to 196.92, 271.82 and 155.61

Step by Step Solution

1. Step 1: Write the proportion equation
   196.92 : 271.82 = 155.61 : x
2. Step 2: Convert to fraction form
   196.92/271.82 = 155.61/x
3. Step 3: Cross multiply
   196.92x = 271.82 × 155.61
4. Step 4: Simplify right side
   196.92x = 42,298.30
5. Step 5: Solve for x
   x = 42,298.30/196.92
6. Step 6: Final answer
   x = 214.80