Finding the Fourth Proportional to 80.82, 120.69 and 72.27

Step by Step Solution

1. Step 1: Write the proportion equation
   80.82 : 120.69 = 72.27 : x
2. Step 2: Convert to fraction form
   80.82/120.69 = 72.27/x
3. Step 3: Cross multiply
   80.82x = 120.69 × 72.27
4. Step 4: Simplify right side
   80.82x = 8,722.27
5. Step 5: Solve for x
   x = 8,722.27/80.82
6. Step 6: Final answer
   x = 107.92