Finding the Third Proportional to 644,813,388 and 1,399,103,612

Step by Step Solution

1. Step 1: Write the proportion equation
   644,813,388 : 1,399,103,612 = 1,399,103,612 : x
2. Step 2: Convert to fraction form
   644,813,388/1,399,103,612 = 1,399,103,612/x
3. Step 3: Cross multiply
   644,813,388x = 1,399,103,612 × 1,399,103,612
4. Step 4: Simplify right side
   644,813,388x = 1,957,490,917,111,446,528
5. Step 5: Solve for x
   x = 1,957,490,917,111,446,528/644,813,388
6. Step 6: Final answer
   x = 3,035,747,944.35