Finding the Third Proportional to 639,820 and 1,400,168

Step by Step Solution

1. Step 1: Write the proportion equation
   639,820 : 1,400,168 = 1,400,168 : x
2. Step 2: Convert to fraction form
   639,820/1,400,168 = 1,400,168/x
3. Step 3: Cross multiply
   639,820x = 1,400,168 × 1,400,168
4. Step 4: Simplify right side
   639,820x = 1,960,470,428,224
5. Step 5: Solve for x
   x = 1,960,470,428,224/639,820
6. Step 6: Final answer
   x = 3,064,096.82