Finding the Third Proportional to 870,842 and 1,280,656

Step by Step Solution

1. Step 1: Write the proportion equation
   870,842 : 1,280,656 = 1,280,656 : x
2. Step 2: Convert to fraction form
   870,842/1,280,656 = 1,280,656/x
3. Step 3: Cross multiply
   870,842x = 1,280,656 × 1,280,656
4. Step 4: Simplify right side
   870,842x = 1,640,079,790,336
5. Step 5: Solve for x
   x = 1,640,079,790,336/870,842
6. Step 6: Final answer
   x = 1,883,326.47