Finding the Third Proportional to 3,998,402 and 8,706,724

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998,402 : 8,706,724 = 8,706,724 : x
2. Step 2: Convert to fraction form
   3,998,402/8,706,724 = 8,706,724/x
3. Step 3: Cross multiply
   3,998,402x = 8,706,724 × 8,706,724
4. Step 4: Simplify right side
   3,998,402x = 75,807,042,812,176
5. Step 5: Solve for x
   x = 75,807,042,812,176/3,998,402
6. Step 6: Final answer
   x = 18,959,334.96