Question 1074492
No but you are close.
Scientific notation usually means the mantissa or significand (the first part) is between 1 and 10. 
Since yours is 27.9, you need to modify it.
{{{27.9=2.79x10^1}}}
So then,
{{{ (4.5x10^4) * (6.2x10^3)= 2.79x10^1*(10^7)}}}

{{{ (4.5x10^4) * (6.2x10^3)= 2.79x10^8}}}