Finding the Third Proportional to 3,972,164 and 8,421,019

Step by Step Solution

1. Step 1: Write the proportion equation
   3,972,164 : 8,421,019 = 8,421,019 : x
2. Step 2: Convert to fraction form
   3,972,164/8,421,019 = 8,421,019/x
3. Step 3: Cross multiply
   3,972,164x = 8,421,019 × 8,421,019
4. Step 4: Simplify right side
   3,972,164x = 70,913,560,998,361
5. Step 5: Solve for x
   x = 70,913,560,998,361/3,972,164
6. Step 6: Final answer
   x = 17,852,626.68