Question 258548
This looks like 
(4123)^(1/(6n))
This is the same as
(4123)^(1/6)^(1/n)
we can estimate
(4123)^(1/6)
as 4.00438
so, we can say
4.00438^(1/n)
or the nth root of 4.00438.
Of course this answer will change as n changes.