In a business proposal, which personal pronoun should be used?

Most business proposals I've seen have employed the company name throughout, like

Corporation, Inc is in need of a…; Corporation, Inc proposes…

The reason? Mostly convention.

I would use, Company, Inc. and replace it, for the sake of not repeating yourself every sentence, with the company or another third-person synonym, but not with the second person.

I understand that while convention demands the use of third person in a business proposal, in some cases I imagine it would pay to use the first person to better connect with your proposal's target audience.

I can think of various scenarios where this might apply: when the investor is close in one way or another to the author of the proposal, or when it is the team or individual that is being sold much more than their idea.

Consistency is the key, pick a person and stick to it.