Finding the Fourth Proportional to 111.37, 167.05 and 42.88

Step by Step Solution

1. Step 1: Write the proportion equation
   111.37 : 167.05 = 42.88 : x
2. Step 2: Convert to fraction form
   111.37/167.05 = 42.88/x
3. Step 3: Cross multiply
   111.37x = 167.05 × 42.88
4. Step 4: Simplify right side
   111.37x = 7,163.10
5. Step 5: Solve for x
   x = 7,163.10/111.37
6. Step 6: Final answer
   x = 64.32