Finding the Third Proportional to 640,934 and 978,350

Step by Step Solution

1. Step 1: Write the proportion equation
   640,934 : 978,350 = 978,350 : x
2. Step 2: Convert to fraction form
   640,934/978,350 = 978,350/x
3. Step 3: Cross multiply
   640,934x = 978,350 × 978,350
4. Step 4: Simplify right side
   640,934x = 957,168,722,500
5. Step 5: Solve for x
   x = 957,168,722,500/640,934
6. Step 6: Final answer
   x = 1,493,396.70