Finding the Fourth Proportional to 111.42, 167.16 and 57.30

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 167.16 = 57.30 : x
2. Step 2: Convert to fraction form
   111.42/167.16 = 57.30/x
3. Step 3: Cross multiply
   111.42x = 167.16 × 57.30
4. Step 4: Simplify right side
   111.42x = 9,578.27
5. Step 5: Solve for x
   x = 9,578.27/111.42
6. Step 6: Final answer
   x = 85.97