Finding the Third Proportional to 3,998,400 and 8,706,720

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998,400 : 8,706,720 = 8,706,720 : x
2. Step 2: Convert to fraction form
   3,998,400/8,706,720 = 8,706,720/x
3. Step 3: Cross multiply
   3,998,400x = 8,706,720 × 8,706,720
4. Step 4: Simplify right side
   3,998,400x = 75,806,973,158,400
5. Step 5: Solve for x
   x = 75,806,973,158,400/3,998,400
6. Step 6: Final answer
   x = 18,959,327.02