Finding the Third Proportional to 449,378 and 978,109

Step by Step Solution

1. Step 1: Write the proportion equation
   449,378 : 978,109 = 978,109 : x
2. Step 2: Convert to fraction form
   449,378/978,109 = 978,109/x
3. Step 3: Cross multiply
   449,378x = 978,109 × 978,109
4. Step 4: Simplify right side
   449,378x = 956,697,215,881
5. Step 5: Solve for x
   x = 956,697,215,881/449,378
6. Step 6: Final answer
   x = 2,128,936.48