Finding the Third Proportional to 639,822 and 1,400,172

Step by Step Solution

1. Step 1: Write the proportion equation
   639,822 : 1,400,172 = 1,400,172 : x
2. Step 2: Convert to fraction form
   639,822/1,400,172 = 1,400,172/x
3. Step 3: Cross multiply
   639,822x = 1,400,172 × 1,400,172
4. Step 4: Simplify right side
   639,822x = 1,960,481,629,584
5. Step 5: Solve for x
   x = 1,960,481,629,584/639,822
6. Step 6: Final answer
   x = 3,064,104.75