Finding the Fourth Proportional to 268.72, 402.82 and 131.88

Step by Step Solution

1. Step 1: Write the proportion equation
   268.72 : 402.82 = 131.88 : x
2. Step 2: Convert to fraction form
   268.72/402.82 = 131.88/x
3. Step 3: Cross multiply
   268.72x = 402.82 × 131.88
4. Step 4: Simplify right side
   268.72x = 53,123.56
5. Step 5: Solve for x
   x = 53,123.56/268.72
6. Step 6: Final answer
   x = 197.69