Finding the Fourth Proportional to 131.86, 181.91 and 82.72

Step by Step Solution

1. Step 1: Write the proportion equation
   131.86 : 181.91 = 82.72 : x
2. Step 2: Convert to fraction form
   131.86/181.91 = 82.72/x
3. Step 3: Cross multiply
   131.86x = 181.91 × 82.72
4. Step 4: Simplify right side
   131.86x = 15,048.03
5. Step 5: Solve for x
   x = 15,048.03/131.86
6. Step 6: Final answer
   x = 114.12