Finding the Fourth Proportional to 111.50, 167.15 and 42.98

Step by Step Solution

1. Step 1: Write the proportion equation
   111.50 : 167.15 = 42.98 : x
2. Step 2: Convert to fraction form
   111.50/167.15 = 42.98/x
3. Step 3: Cross multiply
   111.50x = 167.15 × 42.98
4. Step 4: Simplify right side
   111.50x = 7,183.06
5. Step 5: Solve for x
   x = 7,183.06/111.50
6. Step 6: Final answer
   x = 64.42