Finding the Fourth Proportional to 111.10, 167.68 and 111.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111.10 : 167.68 = 111.10 : x
2. Step 2: Convert to fraction form
   111.10/167.68 = 111.10/x
3. Step 3: Cross multiply
   111.10x = 167.68 × 111.10
4. Step 4: Simplify right side
   111.10x = 18,629.25
5. Step 5: Solve for x
   x = 18,629.25/111.10
6. Step 6: Final answer
   x = 167.68