Finding the Third Proportional to 3,318,663 and 7,221,357

Step by Step Solution

1. Step 1: Write the proportion equation
   3,318,663 : 7,221,357 = 7,221,357 : x
2. Step 2: Convert to fraction form
   3,318,663/7,221,357 = 7,221,357/x
3. Step 3: Cross multiply
   3,318,663x = 7,221,357 × 7,221,357
4. Step 4: Simplify right side
   3,318,663x = 52,147,996,921,449
5. Step 5: Solve for x
   x = 52,147,996,921,449/3,318,663
6. Step 6: Final answer
   x = 15,713,556.01