Finding the Third Proportional to 640,659,456 and 1,398,752,064

Step by Step Solution

1. Step 1: Write the proportion equation
   640,659,456 : 1,398,752,064 = 1,398,752,064 : x
2. Step 2: Convert to fraction form
   640,659,456/1,398,752,064 = 1,398,752,064/x
3. Step 3: Cross multiply
   640,659,456x = 1,398,752,064 × 1,398,752,064
4. Step 4: Simplify right side
   640,659,456x = 1,956,507,336,544,260,096
5. Step 5: Solve for x
   x = 1,956,507,336,544,260,096/640,659,456
6. Step 6: Final answer
   x = 3,053,895,978.93