Finding the Fourth Proportional to 111.68, 168.16 and 103.68

Step by Step Solution

1. Step 1: Write the proportion equation
   111.68 : 168.16 = 103.68 : x
2. Step 2: Convert to fraction form
   111.68/168.16 = 103.68/x
3. Step 3: Cross multiply
   111.68x = 168.16 × 103.68
4. Step 4: Simplify right side
   111.68x = 17,434.83
5. Step 5: Solve for x
   x = 17,434.83/111.68
6. Step 6: Final answer
   x = 156.11