Finding the Third Proportional to 643,853,680.88 and 1,394,670,386.81

Step by Step Solution

1. Step 1: Write the proportion equation
   643,853,680.88 : 1,394,670,386.81 = 1,394,670,386.81 : x
2. Step 2: Convert to fraction form
   643,853,680.88/1,394,670,386.81 = 1,394,670,386.81/x
3. Step 3: Cross multiply
   643,853,680.88x = 1,394,670,386.81 × 1,394,670,386.81
4. Step 4: Simplify right side
   643,853,680.88x = 1,945,105,487,851,728,384
5. Step 5: Solve for x
   x = 1,945,105,487,851,728,384/643,853,680.88
6. Step 6: Final answer
   x = 3,021,036,526.82