Finding the Third Proportional to 644.25 and 1,410

Step by Step Solution

1. Step 1: Write the proportion equation
   644.25 : 1,410 = 1,410 : x
2. Step 2: Convert to fraction form
   644.25/1,410 = 1,410/x
3. Step 3: Cross multiply
   644.25x = 1,410 × 1,410
4. Step 4: Simplify right side
   644.25x = 1,988,100
5. Step 5: Solve for x
   x = 1,988,100/644.25
6. Step 6: Final answer
   x = 3,085.91