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Ah...I think I see what you're doing. You're converting that first figure to kilometres in your head and then writing it down as the answer. You're only confusing yourself and others by doing this....and not getting the right answers.
For instance, you got this for Alpha Cen A...
4.395 x 9.4605284 x 10^18 (assuming your answer was 4.158 x 10^19mm)
= 4.158 x 10^13 (km, not mm)
That answer is correct, but leave it at 4.158 x 10^19 (mm), which will give you the correct final answer.
But even still, when you get the calc' wrong in the first place...
(Rigel)
810 x 9.4605284 x 10^18
= 7.66 x 10^12 (should be 7.66 x 10^21mm)
You get 7.66 x 10^15km (not 7.66 x 10^12km)
What you've done here is multiplied it out but for some reason used 18 as the exponent instead of the correct answer, 21, and then did your conversion (which is unnecessary).
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