Finding the Third Proportional to 4,470,512 and 9,718,866

Step by Step Solution

1. Step 1: Write the proportion equation
   4,470,512 : 9,718,866 = 9,718,866 : x
2. Step 2: Convert to fraction form
   4,470,512/9,718,866 = 9,718,866/x
3. Step 3: Cross multiply
   4,470,512x = 9,718,866 × 9,718,866
4. Step 4: Simplify right side
   4,470,512x = 94,456,356,325,956
5. Step 5: Solve for x
   x = 94,456,356,325,956/4,470,512
6. Step 6: Final answer
   x = 21,128,755.79