Finding the Fourth Proportional to 111.11, 166.56 and 42.59

Step by Step Solution

1. Step 1: Write the proportion equation
   111.11 : 166.56 = 42.59 : x
2. Step 2: Convert to fraction form
   111.11/166.56 = 42.59/x
3. Step 3: Cross multiply
   111.11x = 166.56 × 42.59
4. Step 4: Simplify right side
   111.11x = 7,092.96
5. Step 5: Solve for x
   x = 7,092.96/111.11
6. Step 6: Final answer
   x = 63.84