Finding the Third Proportional to 640,984 and 978,426

Step by Step Solution

1. Step 1: Write the proportion equation
   640,984 : 978,426 = 978,426 : x
2. Step 2: Convert to fraction form
   640,984/978,426 = 978,426/x
3. Step 3: Cross multiply
   640,984x = 978,426 × 978,426
4. Step 4: Simplify right side
   640,984x = 957,317,437,476
5. Step 5: Solve for x
   x = 957,317,437,476/640,984
6. Step 6: Final answer
   x = 1,493,512.22