Finding the Third Proportional to 389,626 and 699,710

Step by Step Solution

1. Step 1: Write the proportion equation
   389,626 : 699,710 = 699,710 : x
2. Step 2: Convert to fraction form
   389,626/699,710 = 699,710/x
3. Step 3: Cross multiply
   389,626x = 699,710 × 699,710
4. Step 4: Simplify right side
   389,626x = 489,594,084,100
5. Step 5: Solve for x
   x = 489,594,084,100/389,626
6. Step 6: Final answer
   x = 1,256,574.47