Finding the Third Proportional to 3,807,578 and 8,309,702

Step by Step Solution

1. Step 1: Write the proportion equation
   3,807,578 : 8,309,702 = 8,309,702 : x
2. Step 2: Convert to fraction form
   3,807,578/8,309,702 = 8,309,702/x
3. Step 3: Cross multiply
   3,807,578x = 8,309,702 × 8,309,702
4. Step 4: Simplify right side
   3,807,578x = 69,051,147,328,804
5. Step 5: Solve for x
   x = 69,051,147,328,804/3,807,578
6. Step 6: Final answer
   x = 18,135,189.18