Finding the Third Proportional to 3,998,424 and 8,706,768

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998,424 : 8,706,768 = 8,706,768 : x
2. Step 2: Convert to fraction form
   3,998,424/8,706,768 = 8,706,768/x
3. Step 3: Cross multiply
   3,998,424x = 8,706,768 × 8,706,768
4. Step 4: Simplify right side
   3,998,424x = 75,807,809,005,824
5. Step 5: Solve for x
   x = 75,807,809,005,824/3,998,424
6. Step 6: Final answer
   x = 18,959,422.26