Paleontologists believe that fragments of a primate jawbone unearthed

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Having gone through the question and your query, we believe that we can help resolve your doubts.

The distinction here lies in terms of meaning. The use of "estimated at + numerical value" is appropriate when referring to an entity that can be expressed numerically in the terms used. To use the examples you have provided, "Company was estimated at $3 million." is incorrect, as "Company" cannot be numerically expressed in terms of currency; such an expression leads to an incoherent meaning. Conversely, in the sentence "The power of hydroelectric station is estimated at 13 MW.", the "power" of the station can be expressed numerically in terms of MW, so this usage makes sense, meaning it is correct. Similarly, "temperatures" is also something that can be expressed numerically in terms of "degrees", so the usage of "estimated at" is correct.

Coming back to the first example, if the sentence was "The value of the company was estimated at $3million." the use of "estimated at" would be correct, as the "value" of a company can be expressed numerically in terms of current.

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