Finding the Fourth Proportional to 111.49, 167.20 and 42.96

Step by Step Solution

1. Step 1: Write the proportion equation
   111.49 : 167.20 = 42.96 : x
2. Step 2: Convert to fraction form
   111.49/167.20 = 42.96/x
3. Step 3: Cross multiply
   111.49x = 167.20 × 42.96
4. Step 4: Simplify right side
   111.49x = 7,182.91
5. Step 5: Solve for x
   x = 7,182.91/111.49
6. Step 6: Final answer
   x = 64.43