Is there a way to write a fraction in unary number system?
What I mean is to write a fraction part using a "comma" notation. Writing it just as a fraction is obvious: $$ \frac {111}{1111}_{(1)} = \frac {3}{4}_{(10)} $$
For other positional system's it's easy as the fraction digits are defined as a base to the power of -1, -2, -3 and so on. But for unary it doesn't work.
I know the unary number system doesn't even have zero and fractions are a step further.
But maybe there is some way to write it?