Finding the Third Proportional to 3,974,624 and 8,621,386

Step by Step Solution

1. Step 1: Write the proportion equation
   3,974,624 : 8,621,386 = 8,621,386 : x
2. Step 2: Convert to fraction form
   3,974,624/8,621,386 = 8,621,386/x
3. Step 3: Cross multiply
   3,974,624x = 8,621,386 × 8,621,386
4. Step 4: Simplify right side
   3,974,624x = 74,328,296,560,996
5. Step 5: Solve for x
   x = 74,328,296,560,996/3,974,624
6. Step 6: Final answer
   x = 18,700,711.45