Finding the Fourth Proportional to 111.27, 167.09 and 106.91

Step by Step Solution

1. Step 1: Write the proportion equation
   111.27 : 167.09 = 106.91 : x
2. Step 2: Convert to fraction form
   111.27/167.09 = 106.91/x
3. Step 3: Cross multiply
   111.27x = 167.09 × 106.91
4. Step 4: Simplify right side
   111.27x = 17,862.22
5. Step 5: Solve for x
   x = 17,862.22/111.27
6. Step 6: Final answer
   x = 160.53