Finding the Fourth Proportional to 111.43, 167.15 and 57.31

Step by Step Solution

1. Step 1: Write the proportion equation
   111.43 : 167.15 = 57.31 : x
2. Step 2: Convert to fraction form
   111.43/167.15 = 57.31/x
3. Step 3: Cross multiply
   111.43x = 167.15 × 57.31
4. Step 4: Simplify right side
   111.43x = 9,579.37
5. Step 5: Solve for x
   x = 9,579.37/111.43
6. Step 6: Final answer
   x = 85.97