Finding the Fourth Proportional to 111.24, 166.82 and 42.80

Step by Step Solution

1. Step 1: Write the proportion equation
   111.24 : 166.82 = 42.80 : x
2. Step 2: Convert to fraction form
   111.24/166.82 = 42.80/x
3. Step 3: Cross multiply
   111.24x = 166.82 × 42.80
4. Step 4: Simplify right side
   111.24x = 7,138.85
5. Step 5: Solve for x
   x = 7,138.85/111.24
6. Step 6: Final answer
   x = 64.18