Finding the Third Proportional to 639,884 and 1,400,296

Step by Step Solution

1. Step 1: Write the proportion equation
   639,884 : 1,400,296 = 1,400,296 : x
2. Step 2: Convert to fraction form
   639,884/1,400,296 = 1,400,296/x
3. Step 3: Cross multiply
   639,884x = 1,400,296 × 1,400,296
4. Step 4: Simplify right side
   639,884x = 1,960,828,887,616
5. Step 5: Solve for x
   x = 1,960,828,887,616/639,884
6. Step 6: Final answer
   x = 3,064,350.55