Finding the Third Proportional to 640,968 and 978,402

Step by Step Solution

1. Step 1: Write the proportion equation
   640,968 : 978,402 = 978,402 : x
2. Step 2: Convert to fraction form
   640,968/978,402 = 978,402/x
3. Step 3: Cross multiply
   640,968x = 978,402 × 978,402
4. Step 4: Simplify right side
   640,968x = 957,270,473,604
5. Step 5: Solve for x
   x = 957,270,473,604/640,968
6. Step 6: Final answer
   x = 1,493,476.23