Finding the Third Proportional to 3,974,586 and 8,621,310

Step by Step Solution

1. Step 1: Write the proportion equation
   3,974,586 : 8,621,310 = 8,621,310 : x
2. Step 2: Convert to fraction form
   3,974,586/8,621,310 = 8,621,310/x
3. Step 3: Cross multiply
   3,974,586x = 8,621,310 × 8,621,310
4. Step 4: Simplify right side
   3,974,586x = 74,326,986,116,100
5. Step 5: Solve for x
   x = 74,326,986,116,100/3,974,586
6. Step 6: Final answer
   x = 18,700,560.54