Finding the Third Proportional to 449,672 and 978,640

Step by Step Solution

1. Step 1: Write the proportion equation
   449,672 : 978,640 = 978,640 : x
2. Step 2: Convert to fraction form
   449,672/978,640 = 978,640/x
3. Step 3: Cross multiply
   449,672x = 978,640 × 978,640
4. Step 4: Simplify right side
   449,672x = 957,736,249,600
5. Step 5: Solve for x
   x = 957,736,249,600/449,672
6. Step 6: Final answer
   x = 2,129,855.20