Finding the Fourth Proportional to 196.72, 271.49 and 112.72

Step by Step Solution

1. Step 1: Write the proportion equation
   196.72 : 271.49 = 112.72 : x
2. Step 2: Convert to fraction form
   196.72/271.49 = 112.72/x
3. Step 3: Cross multiply
   196.72x = 271.49 × 112.72
4. Step 4: Simplify right side
   196.72x = 30,601.11
5. Step 5: Solve for x
   x = 30,601.11/196.72
6. Step 6: Final answer
   x = 155.56