Finding the Fourth Proportional to 111.91, 167.88 and 106.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111.91 : 167.88 = 106.72 : x
2. Step 2: Convert to fraction form
   111.91/167.88 = 106.72/x
3. Step 3: Cross multiply
   111.91x = 167.88 × 106.72
4. Step 4: Simplify right side
   111.91x = 17,916.15
5. Step 5: Solve for x
   x = 17,916.15/111.91
6. Step 6: Final answer
   x = 160.09