Finding the Fourth Proportional to 111.79, 154.20 and 68.15

Step by Step Solution

1. Step 1: Write the proportion equation
   111.79 : 154.20 = 68.15 : x
2. Step 2: Convert to fraction form
   111.79/154.20 = 68.15/x
3. Step 3: Cross multiply
   111.79x = 154.20 × 68.15
4. Step 4: Simplify right side
   111.79x = 10,509.37
5. Step 5: Solve for x
   x = 10,509.37/111.79
6. Step 6: Final answer
   x = 94.01