Finding the Fourth Proportional to 196.88, 271.79 and 131.72

Step by Step Solution

1. Step 1: Write the proportion equation
   196.88 : 271.79 = 131.72 : x
2. Step 2: Convert to fraction form
   196.88/271.79 = 131.72/x
3. Step 3: Cross multiply
   196.88x = 271.79 × 131.72
4. Step 4: Simplify right side
   196.88x = 35,799.52
5. Step 5: Solve for x
   x = 35,799.52/196.88
6. Step 6: Final answer
   x = 181.84