Finding the Third Proportional to 639,881 and 1,400,290

Step by Step Solution

1. Step 1: Write the proportion equation
   639,881 : 1,400,290 = 1,400,290 : x
2. Step 2: Convert to fraction form
   639,881/1,400,290 = 1,400,290/x
3. Step 3: Cross multiply
   639,881x = 1,400,290 × 1,400,290
4. Step 4: Simplify right side
   639,881x = 1,960,812,084,100
5. Step 5: Solve for x
   x = 1,960,812,084,100/639,881
6. Step 6: Final answer
   x = 3,064,338.66