Finding the Fourth Proportional to 111.72, 154.28 and 82.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111.72 : 154.28 = 82.72 : x
2. Step 2: Convert to fraction form
   111.72/154.28 = 82.72/x
3. Step 3: Cross multiply
   111.72x = 154.28 × 82.72
4. Step 4: Simplify right side
   111.72x = 12,762.04
5. Step 5: Solve for x
   x = 12,762.04/111.72
6. Step 6: Final answer
   x = 114.23