Finding the Third Proportional to 639,770 and 1,358,260

Step by Step Solution

1. Step 1: Write the proportion equation
   639,770 : 1,358,260 = 1,358,260 : x
2. Step 2: Convert to fraction form
   639,770/1,358,260 = 1,358,260/x
3. Step 3: Cross multiply
   639,770x = 1,358,260 × 1,358,260
4. Step 4: Simplify right side
   639,770x = 1,844,870,227,600
5. Step 5: Solve for x
   x = 1,844,870,227,600/639,770
6. Step 6: Final answer
   x = 2,883,646.04