Finding the Fourth Proportional to 111.62, 154.24 and 100.82

Step by Step Solution

1. Step 1: Write the proportion equation
   111.62 : 154.24 = 100.82 : x
2. Step 2: Convert to fraction form
   111.62/154.24 = 100.82/x
3. Step 3: Cross multiply
   111.62x = 154.24 × 100.82
4. Step 4: Simplify right side
   111.62x = 15,550.48
5. Step 5: Solve for x
   x = 15,550.48/111.62
6. Step 6: Final answer
   x = 139.32