Finding the Third Proportional to 868,638 and 1,328,790

Step by Step Solution

1. Step 1: Write the proportion equation
   868,638 : 1,328,790 = 1,328,790 : x
2. Step 2: Convert to fraction form
   868,638/1,328,790 = 1,328,790/x
3. Step 3: Cross multiply
   868,638x = 1,328,790 × 1,328,790
4. Step 4: Simplify right side
   868,638x = 1,765,682,864,100
5. Step 5: Solve for x
   x = 1,765,682,864,100/868,638
6. Step 6: Final answer
   x = 2,032,702.76