Finding the Third Proportional to 449,391 and 978,128

Step by Step Solution

1. Step 1: Write the proportion equation
   449,391 : 978,128 = 978,128 : x
2. Step 2: Convert to fraction form
   449,391/978,128 = 978,128/x
3. Step 3: Cross multiply
   449,391x = 978,128 × 978,128
4. Step 4: Simplify right side
   449,391x = 956,734,384,384
5. Step 5: Solve for x
   x = 956,734,384,384/449,391
6. Step 6: Final answer
   x = 2,128,957.60