Finding the Fourth Proportional to 111.38, 167.08 and 42.90

Step by Step Solution

1. Step 1: Write the proportion equation
   111.38 : 167.08 = 42.90 : x
2. Step 2: Convert to fraction form
   111.38/167.08 = 42.90/x
3. Step 3: Cross multiply
   111.38x = 167.08 × 42.90
4. Step 4: Simplify right side
   111.38x = 7,167.73
5. Step 5: Solve for x
   x = 7,167.73/111.38
6. Step 6: Final answer
   x = 64.35