Can any one please tell me?

“How to calculate coefficient of independent variable in non linear regression?”

For example I want to calculate value of y

Y=a + b*x1 + c*x2 + d*x3

Here;

Y= Dependant variable

a, b, c, d = constant

x1, x2, x3= independent variable.

In this case how to calculate value of a, b, c and d. If you have any idea please tell me how to calculate it