Finding the Fourth Proportional to 111.78, 154.17 and 82.62

Step by Step Solution

1. Step 1: Write the proportion equation
   111.78 : 154.17 = 82.62 : x
2. Step 2: Convert to fraction form
   111.78/154.17 = 82.62/x
3. Step 3: Cross multiply
   111.78x = 154.17 × 82.62
4. Step 4: Simplify right side
   111.78x = 12,737.53
5. Step 5: Solve for x
   x = 12,737.53/111.78
6. Step 6: Final answer
   x = 113.95