Finding the Fourth Proportional to 196.72, 271.55 and 125.91

Step by Step Solution

1. Step 1: Write the proportion equation
   196.72 : 271.55 = 125.91 : x
2. Step 2: Convert to fraction form
   196.72/271.55 = 125.91/x
3. Step 3: Cross multiply
   196.72x = 271.55 × 125.91
4. Step 4: Simplify right side
   196.72x = 34,191.18
5. Step 5: Solve for x
   x = 34,191.18/196.72
6. Step 6: Final answer
   x = 173.81