Finding the Third Proportional to 640.25 and 1,019.25

Step by Step Solution

1. Step 1: Write the proportion equation
   640.25 : 1,019.25 = 1,019.25 : x
2. Step 2: Convert to fraction form
   640.25/1,019.25 = 1,019.25/x
3. Step 3: Cross multiply
   640.25x = 1,019.25 × 1,019.25
4. Step 4: Simplify right side
   640.25x = 1,038,870.56
5. Step 5: Solve for x
   x = 1,038,870.56/640.25
6. Step 6: Final answer
   x = 1,622.60