Finding the Third Proportional to 4,707,777 and 9,980,499

Step by Step Solution

1. Step 1: Write the proportion equation
   4,707,777 : 9,980,499 = 9,980,499 : x
2. Step 2: Convert to fraction form
   4,707,777/9,980,499 = 9,980,499/x
3. Step 3: Cross multiply
   4,707,777x = 9,980,499 × 9,980,499
4. Step 4: Simplify right side
   4,707,777x = 99,610,360,289,001
5. Step 5: Solve for x
   x = 99,610,360,289,001/4,707,777
6. Step 6: Final answer
   x = 21,158,682.81