Finding the Third Proportional to 639,886 and 1,400,300

Step by Step Solution

1. Step 1: Write the proportion equation
   639,886 : 1,400,300 = 1,400,300 : x
2. Step 2: Convert to fraction form
   639,886/1,400,300 = 1,400,300/x
3. Step 3: Cross multiply
   639,886x = 1,400,300 × 1,400,300
4. Step 4: Simplify right side
   639,886x = 1,960,840,090,000
5. Step 5: Solve for x
   x = 1,960,840,090,000/639,886
6. Step 6: Final answer
   x = 3,064,358.48