Question

How did the commercial revolution contribute to the start of the industrial revolution in Great Britain

Answer 1

The commercial revolution allowed for two key components.  
First they allowed joint stock companies to put money into a company.  
If the company failed not all your money was lost.  
Second the commercial revolution allowed for major raw resources to be brought to Europe, which in turn was finished products.  

Answer 2

it allowed British companies to easily secure capital and ship their products overseas