Finding the Third Proportional to 870,877 and 1,280,705

Step by Step Solution

1. Step 1: Write the proportion equation
   870,877 : 1,280,705 = 1,280,705 : x
2. Step 2: Convert to fraction form
   870,877/1,280,705 = 1,280,705/x
3. Step 3: Cross multiply
   870,877x = 1,280,705 × 1,280,705
4. Step 4: Simplify right side
   870,877x = 1,640,205,297,025
5. Step 5: Solve for x
   x = 1,640,205,297,025/870,877
6. Step 6: Final answer
   x = 1,883,394.90