Finding the Third Proportional to 644,813,390 and 1,399,103,616

Step by Step Solution

1. Step 1: Write the proportion equation
   644,813,390 : 1,399,103,616 = 1,399,103,616 : x
2. Step 2: Convert to fraction form
   644,813,390/1,399,103,616 = 1,399,103,616/x
3. Step 3: Cross multiply
   644,813,390x = 1,399,103,616 × 1,399,103,616
4. Step 4: Simplify right side
   644,813,390x = 1,957,490,928,304,275,456
5. Step 5: Solve for x
   x = 1,957,490,928,304,275,456/644,813,390
6. Step 6: Final answer
   x = 3,035,747,952.29