Finding the Third Proportional to 144.28 and 216.98

Step by Step Solution

1. Step 1: Write the proportion equation
   144.28 : 216.98 = 216.98 : x
2. Step 2: Convert to fraction form
   144.28/216.98 = 216.98/x
3. Step 3: Cross multiply
   144.28x = 216.98 × 216.98
4. Step 4: Simplify right side
   144.28x = 47,082.22
5. Step 5: Solve for x
   x = 47,082.22/144.28
6. Step 6: Final answer
   x = 326.32