Finding the Third Proportional to 639,796 and 1,400,120

Step by Step Solution

1. Step 1: Write the proportion equation
   639,796 : 1,400,120 = 1,400,120 : x
2. Step 2: Convert to fraction form
   639,796/1,400,120 = 1,400,120/x
3. Step 3: Cross multiply
   639,796x = 1,400,120 × 1,400,120
4. Step 4: Simplify right side
   639,796x = 1,960,336,014,400
5. Step 5: Solve for x
   x = 1,960,336,014,400/639,796
6. Step 6: Final answer
   x = 3,064,001.67