Finding the Fourth Proportional to 111.97, 168.02 and 42.61

Step by Step Solution

1. Step 1: Write the proportion equation
   111.97 : 168.02 = 42.61 : x
2. Step 2: Convert to fraction form
   111.97/168.02 = 42.61/x
3. Step 3: Cross multiply
   111.97x = 168.02 × 42.61
4. Step 4: Simplify right side
   111.97x = 7,158.28
5. Step 5: Solve for x
   x = 7,158.28/111.97
6. Step 6: Final answer
   x = 63.93