Finding the Third Proportional to 870,879 and 1,280,707

Step by Step Solution

1. Step 1: Write the proportion equation
   870,879 : 1,280,707 = 1,280,707 : x
2. Step 2: Convert to fraction form
   870,879/1,280,707 = 1,280,707/x
3. Step 3: Cross multiply
   870,879x = 1,280,707 × 1,280,707
4. Step 4: Simplify right side
   870,879x = 1,640,210,419,849
5. Step 5: Solve for x
   x = 1,640,210,419,849/870,879
6. Step 6: Final answer
   x = 1,883,396.45