Finding the Fourth Proportional to 111.96, 167.94 and 81.54

Step by Step Solution

1. Step 1: Write the proportion equation
   111.96 : 167.94 = 81.54 : x
2. Step 2: Convert to fraction form
   111.96/167.94 = 81.54/x
3. Step 3: Cross multiply
   111.96x = 167.94 × 81.54
4. Step 4: Simplify right side
   111.96x = 13,693.83
5. Step 5: Solve for x
   x = 13,693.83/111.96
6. Step 6: Final answer
   x = 122.31