Finding the Fourth Proportional to 111.06, 166.72 and 72.44

Step by Step Solution

1. Step 1: Write the proportion equation
   111.06 : 166.72 = 72.44 : x
2. Step 2: Convert to fraction form
   111.06/166.72 = 72.44/x
3. Step 3: Cross multiply
   111.06x = 166.72 × 72.44
4. Step 4: Simplify right side
   111.06x = 12,077.20
5. Step 5: Solve for x
   x = 12,077.20/111.06
6. Step 6: Final answer
   x = 108.74