Finding the Third Proportional to 639,898 and 1,400,324

Step by Step Solution

1. Step 1: Write the proportion equation
   639,898 : 1,400,324 = 1,400,324 : x
2. Step 2: Convert to fraction form
   639,898/1,400,324 = 1,400,324/x
3. Step 3: Cross multiply
   639,898x = 1,400,324 × 1,400,324
4. Step 4: Simplify right side
   639,898x = 1,960,907,304,976
5. Step 5: Solve for x
   x = 1,960,907,304,976/639,898
6. Step 6: Final answer
   x = 3,064,406.05