Finding the Third Proportional to 643,626 and 1,399,315.50

Step by Step Solution

1. Step 1: Write the proportion equation
   643,626 : 1,399,315.50 = 1,399,315.50 : x
2. Step 2: Convert to fraction form
   643,626/1,399,315.50 = 1,399,315.50/x
3. Step 3: Cross multiply
   643,626x = 1,399,315.50 × 1,399,315.50
4. Step 4: Simplify right side
   643,626x = 1,958,083,868,540.25
5. Step 5: Solve for x
   x = 1,958,083,868,540.25/643,626
6. Step 6: Final answer
   x = 3,042,269.69