Finding the Fourth Proportional to 111.29, 166.82 and 42.85

Step by Step Solution

1. Step 1: Write the proportion equation
   111.29 : 166.82 = 42.85 : x
2. Step 2: Convert to fraction form
   111.29/166.82 = 42.85/x
3. Step 3: Cross multiply
   111.29x = 166.82 × 42.85
4. Step 4: Simplify right side
   111.29x = 7,148.24
5. Step 5: Solve for x
   x = 7,148.24/111.29
6. Step 6: Final answer
   x = 64.23