Finding the Third Proportional to 3,974,610 and 8,621,358

Step by Step Solution

1. Step 1: Write the proportion equation
   3,974,610 : 8,621,358 = 8,621,358 : x
2. Step 2: Convert to fraction form
   3,974,610/8,621,358 = 8,621,358/x
3. Step 3: Cross multiply
   3,974,610x = 8,621,358 × 8,621,358
4. Step 4: Simplify right side
   3,974,610x = 74,327,813,764,164
5. Step 5: Solve for x
   x = 74,327,813,764,164/3,974,610
6. Step 6: Final answer
   x = 18,700,655.85