The editors should shut up if they don't know how.
Yes, if only +-*/() is allowed, It would be impossible.
If recurring digits is allowed, The answer is:
4! / (.4` * sqrt(.4`)) - 4
While .4' being 0.4444444444...
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4-4*4+4=4
4+4-(4/4)=7
There are 100,230 fours.There are 100,230 fours.There are 100,230 fours.There are 100,230 fours.
It means that a 4 piston engine is smoothly running because it's 'firing on all fours'