Finding the Fourth Proportional to 131.72, 181.72 and 82.68

Step by Step Solution

1. Step 1: Write the proportion equation
   131.72 : 181.72 = 82.68 : x
2. Step 2: Convert to fraction form
   131.72/181.72 = 82.68/x
3. Step 3: Cross multiply
   131.72x = 181.72 × 82.68
4. Step 4: Simplify right side
   131.72x = 15,024.61
5. Step 5: Solve for x
   x = 15,024.61/131.72
6. Step 6: Final answer
   x = 114.06