Finding the Third Proportional to 449,663 and 978,643

Step by Step Solution

1. Step 1: Write the proportion equation
   449,663 : 978,643 = 978,643 : x
2. Step 2: Convert to fraction form
   449,663/978,643 = 978,643/x
3. Step 3: Cross multiply
   449,663x = 978,643 × 978,643
4. Step 4: Simplify right side
   449,663x = 957,742,121,449
5. Step 5: Solve for x
   x = 957,742,121,449/449,663
6. Step 6: Final answer
   x = 2,129,910.89