Finding the Third Proportional to 3,669,485 and 8,290,299

Step by Step Solution

1. Step 1: Write the proportion equation
   3,669,485 : 8,290,299 = 8,290,299 : x
2. Step 2: Convert to fraction form
   3,669,485/8,290,299 = 8,290,299/x
3. Step 3: Cross multiply
   3,669,485x = 8,290,299 × 8,290,299
4. Step 4: Simplify right side
   3,669,485x = 68,729,057,509,401
5. Step 5: Solve for x
   x = 68,729,057,509,401/3,669,485
6. Step 6: Final answer
   x = 18,729,891.94