Finding the Fourth Proportional to 111.48, 166.17 and 107.16

Step by Step Solution

1. Step 1: Write the proportion equation
   111.48 : 166.17 = 107.16 : x
2. Step 2: Convert to fraction form
   111.48/166.17 = 107.16/x
3. Step 3: Cross multiply
   111.48x = 166.17 × 107.16
4. Step 4: Simplify right side
   111.48x = 17,806.78
5. Step 5: Solve for x
   x = 17,806.78/111.48
6. Step 6: Final answer
   x = 159.73