Finding the Fourth Proportional to 111.12, 166.60 and 42.62

Step by Step Solution

1. Step 1: Write the proportion equation
   111.12 : 166.60 = 42.62 : x
2. Step 2: Convert to fraction form
   111.12/166.60 = 42.62/x
3. Step 3: Cross multiply
   111.12x = 166.60 × 42.62
4. Step 4: Simplify right side
   111.12x = 7,100.49
5. Step 5: Solve for x
   x = 7,100.49/111.12
6. Step 6: Final answer
   x = 63.90