Accepted answer
118 to 163 g a day. The range the resistance-training literature supports is 1.6 to 2.2 g per kilogram, which at 74 kg is 118–163 g. At 4 kcal per gram that is 474–651 kcal, or 53–72 per cent of a 900 intake — which is why protein has to be planned first at this energy level rather than fitted in afterwards. Split it across three or four servings; roughly 0.4 g/kg per meal saturates the synthetic response and the surplus in one large serving does not carry over.
The honest answer is that most people in a deficit fall well short, and closing that gap matters more than any refinement above it.
Older adults need more per meal to overcome anabolic resistance, with 1.2 to 1.5 g/kg daily commonly quoted for maintenance and more in a deficit.
Use reference or adjusted body weight rather than total weight where adiposity is substantial: a common approach is ideal body weight plus a quarter of the excess, which avoids targets that no one could eat.
Stable-isotope feeding studies establish the per-meal saturation of muscle protein synthesis at around 0.4 g/kg in young adults and higher in older ones.
Nothing here is dietetic or medical advice.
Plan protein first in the day; with suppressed appetite it will not happen otherwise.