Finding the Third Proportional to 644.55 and 1,323.28

Step by Step Solution

1. Step 1: Write the proportion equation
   644.55 : 1,323.28 = 1,323.28 : x
2. Step 2: Convert to fraction form
   644.55/1,323.28 = 1,323.28/x
3. Step 3: Cross multiply
   644.55x = 1,323.28 × 1,323.28
4. Step 4: Simplify right side
   644.55x = 1,751,073.27
5. Step 5: Solve for x
   x = 1,751,073.27/644.55
6. Step 6: Final answer
   x = 2,716.72