Finding the Fourth Proportional to 111.42, 167.09 and 42

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 167.09 = 42 : x
2. Step 2: Convert to fraction form
   111.42/167.09 = 42/x
3. Step 3: Cross multiply
   111.42x = 167.09 × 42
4. Step 4: Simplify right side
   111.42x = 7,017.78
5. Step 5: Solve for x
   x = 7,017.78/111.42
6. Step 6: Final answer
   x = 62.98