Finding the Third Proportional to 640,982 and 978,423

Step by Step Solution

1. Step 1: Write the proportion equation
   640,982 : 978,423 = 978,423 : x
2. Step 2: Convert to fraction form
   640,982/978,423 = 978,423/x
3. Step 3: Cross multiply
   640,982x = 978,423 × 978,423
4. Step 4: Simplify right side
   640,982x = 957,311,566,929
5. Step 5: Solve for x
   x = 957,311,566,929/640,982
6. Step 6: Final answer
   x = 1,493,507.72