to target at/on/for/towards

Perhaps I am missing the point, but 'Target' as a verb is usually used without a preposition following it. As in:

'Let's target a 50% increase in sales this year'.

The passive voice uses prepositions after Target, as witnessed by the following extractions from Cambridge and Oxford online dictionaries, in that order

The use of 'Aim' would include a preposition, as in:

'Let's aim for a 50% increase in sales this year'.

As far as use is concerned (which wasn't the question, but I think it's relevant), 'Target' is less used as a verb than 'Aim', but it's not unknown. Ngram gives the following result for the search 'let's target, let's aim'. I considered searching for 'to target, to aim', but I think the results were skewed by such phrases as 'missile time to target'.

Testing 'We'll aim, We'll target' gave the following results: