Finding the Fourth Proportional to 111.24, 168.12 and 111.24

Step by Step Solution

1. Step 1: Write the proportion equation
   111.24 : 168.12 = 111.24 : x
2. Step 2: Convert to fraction form
   111.24/168.12 = 111.24/x
3. Step 3: Cross multiply
   111.24x = 168.12 × 111.24
4. Step 4: Simplify right side
   111.24x = 18,701.67
5. Step 5: Solve for x
   x = 18,701.67/111.24
6. Step 6: Final answer
   x = 168.12