Finding the Fourth Proportional to 111.14, 166.66 and 42.69

Step by Step Solution

1. Step 1: Write the proportion equation
   111.14 : 166.66 = 42.69 : x
2. Step 2: Convert to fraction form
   111.14/166.66 = 42.69/x
3. Step 3: Cross multiply
   111.14x = 166.66 × 42.69
4. Step 4: Simplify right side
   111.14x = 7,115.23
5. Step 5: Solve for x
   x = 7,115.23/111.14
6. Step 6: Final answer
   x = 64.02