Finding the Third Proportional to 640,962 and 978,393

Step by Step Solution

1. Step 1: Write the proportion equation
   640,962 : 978,393 = 978,393 : x
2. Step 2: Convert to fraction form
   640,962/978,393 = 978,393/x
3. Step 3: Cross multiply
   640,962x = 978,393 × 978,393
4. Step 4: Simplify right side
   640,962x = 957,252,862,449
5. Step 5: Solve for x
   x = 957,252,862,449/640,962
6. Step 6: Final answer
   x = 1,493,462.74