Finding the Fourth Proportional to 196.88, 271.72 and 113.96

Step by Step Solution

1. Step 1: Write the proportion equation
   196.88 : 271.72 = 113.96 : x
2. Step 2: Convert to fraction form
   196.88/271.72 = 113.96/x
3. Step 3: Cross multiply
   196.88x = 271.72 × 113.96
4. Step 4: Simplify right side
   196.88x = 30,965.21
5. Step 5: Solve for x
   x = 30,965.21/196.88
6. Step 6: Final answer
   x = 157.28