The conversion from 872c to RGB is as follows:
Pantone 872c (gold colour)
- R = 162
- G = 145
- B = 70
For those who are unfamiliar with this, RGB is an additive colour model in which red, green and blue light are added together in different ways to produce a huge array of colour.
The name comes from the initials of the three additive primary colours - Red, green and blue.
The RGB colour model is based on the human perception of colours, so it was already known before the computer age. It's main purpose is the representation, sensing and display of images in things like televisions and computers, though it can also be used in conventional photography.