Finding the Third Proportional to 643,853,683 and 1,394,670,391

Step by Step Solution

1. Step 1: Write the proportion equation
   643,853,683 : 1,394,670,391 = 1,394,670,391 : x
2. Step 2: Convert to fraction form
   643,853,683/1,394,670,391 = 1,394,670,391/x
3. Step 3: Cross multiply
   643,853,683x = 1,394,670,391 × 1,394,670,391
4. Step 4: Simplify right side
   643,853,683x = 1,945,105,499,532,092,928
5. Step 5: Solve for x
   x = 1,945,105,499,532,092,928/643,853,683
6. Step 6: Final answer
   x = 3,021,036,534.99