Finding the Third Proportional to 643,405 and 1,270,662

Step by Step Solution

1. Step 1: Write the proportion equation
   643,405 : 1,270,662 = 1,270,662 : x
2. Step 2: Convert to fraction form
   643,405/1,270,662 = 1,270,662/x
3. Step 3: Cross multiply
   643,405x = 1,270,662 × 1,270,662
4. Step 4: Simplify right side
   643,405x = 1,614,581,918,244
5. Step 5: Solve for x
   x = 1,614,581,918,244/643,405
6. Step 6: Final answer
   x = 2,509,433.28