Finding the Third Proportional to 399,058,770,896 and 868,367,978,656

Step by Step Solution

1. Step 1: Write the proportion equation
   399,058,770,896 : 868,367,978,656 = 868,367,978,656 : x
2. Step 2: Convert to fraction form
   399,058,770,896/868,367,978,656 = 868,367,978,656/x
3. Step 3: Cross multiply
   399,058,770,896x = 868,367,978,656 × 868,367,978,656
4. Step 4: Simplify right side
   399,058,770,896x = 754,062,946,355,107,309,027,328
5. Step 5: Solve for x
   x = 754,062,946,355,107,309,027,328/399,058,770,896
6. Step 6: Final answer
   x = 1,889,603,740,977.86