Finding the Third Proportional to 643,853,691 and 1,394,670,410.72

Step by Step Solution

1. Step 1: Write the proportion equation
   643,853,691 : 1,394,670,410.72 = 1,394,670,410.72 : x
2. Step 2: Convert to fraction form
   643,853,691/1,394,670,410.72 = 1,394,670,410.72/x
3. Step 3: Cross multiply
   643,853,691x = 1,394,670,410.72 × 1,394,670,410.72
4. Step 4: Simplify right side
   643,853,691x = 1,945,105,554,534,546,432
5. Step 5: Solve for x
   x = 1,945,105,554,534,546,432/643,853,691
6. Step 6: Final answer
   x = 3,021,036,582.88