Finding the Third Proportional to 4,589,556 and 9,989,799

Step by Step Solution

1. Step 1: Write the proportion equation
   4,589,556 : 9,989,799 = 9,989,799 : x
2. Step 2: Convert to fraction form
   4,589,556/9,989,799 = 9,989,799/x
3. Step 3: Cross multiply
   4,589,556x = 9,989,799 × 9,989,799
4. Step 4: Simplify right side
   4,589,556x = 99,796,084,060,401
5. Step 5: Solve for x
   x = 99,796,084,060,401/4,589,556
6. Step 6: Final answer
   x = 21,744,169.60