Probably. Although there are other difficulties in the sentence, perhaps because I'm reading it out of context? Let's just say you need an "an" between "furnish" and "estimate" and then it will at least read better, although I still don't understand it.
I.e. is a Latin abbreviation for "that is" and should be written with periods and followed by a comma (although some would omit the comma): "(i.e., $108,000/12 x 6).
It is often confused with "e.g.", which means "for example".
I.e. is specific, allowing only one acceptable solution, as in your case. E.g. gives a sampling of one or more soultions that may relate to the subject.
A common error with both "e.g." and "for example" is the tendancy to finish with an "etc." (e.g., eggs, bacon, etc.). The "etc." is redundant in a "for example" list. "I want you to buy breakfast stuff: eggs, bacon, etc." is correct, but "I want you to buy breakfast stuff (for example, eggs, bacon, etc.)." is wrong.
I.e. wouldn't allow an etc. either, of course. "I want you to buy everything I need for breakfast (i.e., eggs, butter, bacon, salt, pepper, tomatoes, mushrooms and bread)." That's a complete list, as required by the "that is" or "i.e." expression.
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