Finding the Fourth Proportional to 144.27, 216.50 and 72.18

Step by Step Solution

1. Step 1: Write the proportion equation
   144.27 : 216.50 = 72.18 : x
2. Step 2: Convert to fraction form
   144.27/216.50 = 72.18/x
3. Step 3: Cross multiply
   144.27x = 216.50 × 72.18
4. Step 4: Simplify right side
   144.27x = 15,626.61
5. Step 5: Solve for x
   x = 15,626.61/144.27
6. Step 6: Final answer
   x = 108.32