Finding the Fourth Proportional to 111.91, 154.39 and 68.17

Step by Step Solution

1. Step 1: Write the proportion equation
   111.91 : 154.39 = 68.17 : x
2. Step 2: Convert to fraction form
   111.91/154.39 = 68.17/x
3. Step 3: Cross multiply
   111.91x = 154.39 × 68.17
4. Step 4: Simplify right side
   111.91x = 10,524.77
5. Step 5: Solve for x
   x = 10,524.77/111.91
6. Step 6: Final answer
   x = 94.05