Finding the Third Proportional to 399,058,770,898 and 868,367,978,660

Step by Step Solution

1. Step 1: Write the proportion equation
   399,058,770,898 : 868,367,978,660 = 868,367,978,660 : x
2. Step 2: Convert to fraction form
   399,058,770,898/868,367,978,660 = 868,367,978,660/x
3. Step 3: Cross multiply
   399,058,770,898x = 868,367,978,660 × 868,367,978,660
4. Step 4: Simplify right side
   399,058,770,898x = 754,062,946,362,054,150,193,152
5. Step 5: Solve for x
   x = 754,062,946,362,054,150,193,152/399,058,770,898
6. Step 6: Final answer
   x = 1,889,603,740,985.80