Finding the Fourth Proportional to 111.84, 154.42 and 80.82

Step by Step Solution

1. Step 1: Write the proportion equation
   111.84 : 154.42 = 80.82 : x
2. Step 2: Convert to fraction form
   111.84/154.42 = 80.82/x
3. Step 3: Cross multiply
   111.84x = 154.42 × 80.82
4. Step 4: Simplify right side
   111.84x = 12,480.02
5. Step 5: Solve for x
   x = 12,480.02/111.84
6. Step 6: Final answer
   x = 111.59