Finding the Third Proportional to 451,872 and 978,128

Step by Step Solution

1. Step 1: Write the proportion equation
   451,872 : 978,128 = 978,128 : x
2. Step 2: Convert to fraction form
   451,872/978,128 = 978,128/x
3. Step 3: Cross multiply
   451,872x = 978,128 × 978,128
4. Step 4: Simplify right side
   451,872x = 956,734,384,384
5. Step 5: Solve for x
   x = 956,734,384,384/451,872
6. Step 6: Final answer
   x = 2,117,268.57