Finding the Fourth Proportional to 111.96, 154.56 and 68.31

Step by Step Solution

1. Step 1: Write the proportion equation
   111.96 : 154.56 = 68.31 : x
2. Step 2: Convert to fraction form
   111.96/154.56 = 68.31/x
3. Step 3: Cross multiply
   111.96x = 154.56 × 68.31
4. Step 4: Simplify right side
   111.96x = 10,557.99
5. Step 5: Solve for x
   x = 10,557.99/111.96
6. Step 6: Final answer
   x = 94.30