Finding the Third Proportional to 449,979 and 978,690

Step by Step Solution

1. Step 1: Write the proportion equation
   449,979 : 978,690 = 978,690 : x
2. Step 2: Convert to fraction form
   449,979/978,690 = 978,690/x
3. Step 3: Cross multiply
   449,979x = 978,690 × 978,690
4. Step 4: Simplify right side
   449,979x = 957,834,116,100
5. Step 5: Solve for x
   x = 957,834,116,100/449,979
6. Step 6: Final answer
   x = 2,128,619.59