Finding the Third Proportional to 3,945,684 and 8,621,928

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945,684 : 8,621,928 = 8,621,928 : x
2. Step 2: Convert to fraction form
   3,945,684/8,621,928 = 8,621,928/x
3. Step 3: Cross multiply
   3,945,684x = 8,621,928 × 8,621,928
4. Step 4: Simplify right side
   3,945,684x = 74,337,642,437,184
5. Step 5: Solve for x
   x = 74,337,642,437,184/3,945,684
6. Step 6: Final answer
   x = 18,840,242.26