Finding the Fourth Proportional to 111.75, 167.31 and 82.79

Step by Step Solution

1. Step 1: Write the proportion equation
   111.75 : 167.31 = 82.79 : x
2. Step 2: Convert to fraction form
   111.75/167.31 = 82.79/x
3. Step 3: Cross multiply
   111.75x = 167.31 × 82.79
4. Step 4: Simplify right side
   111.75x = 13,850.76
5. Step 5: Solve for x
   x = 13,850.76/111.75
6. Step 6: Final answer
   x = 123.94