Finding the Third Proportional to 98.72 and 144.28

Step by Step Solution

1. Step 1: Write the proportion equation
   98.72 : 144.28 = 144.28 : x
2. Step 2: Convert to fraction form
   98.72/144.28 = 144.28/x
3. Step 3: Cross multiply
   98.72x = 144.28 × 144.28
4. Step 4: Simplify right side
   98.72x = 20,817.08
5. Step 5: Solve for x
   x = 20,817.08/98.72
6. Step 6: Final answer
   x = 210.87