Finding the Fourth Proportional to 111.54, 167.37 and 109.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111.54 : 167.37 = 109.72 : x
2. Step 2: Convert to fraction form
   111.54/167.37 = 109.72/x
3. Step 3: Cross multiply
   111.54x = 167.37 × 109.72
4. Step 4: Simplify right side
   111.54x = 18,363.63
5. Step 5: Solve for x
   x = 18,363.63/111.54
6. Step 6: Final answer
   x = 164.63