Finding the Third Proportional to 639,260 and 1,378,150

Step by Step Solution

1. Step 1: Write the proportion equation
   639,260 : 1,378,150 = 1,378,150 : x
2. Step 2: Convert to fraction form
   639,260/1,378,150 = 1,378,150/x
3. Step 3: Cross multiply
   639,260x = 1,378,150 × 1,378,150
4. Step 4: Simplify right side
   639,260x = 1,899,297,422,500
5. Step 5: Solve for x
   x = 1,899,297,422,500/639,260
6. Step 6: Final answer
   x = 2,971,087.54