Avoid error while using FindFit?

Questions
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1

Consider the following code:

FindFit[{1.293, -0.768, -0.004, 0}, {1.011, -0.688, -0.004, 0}, a x1 + b x2 + c x3 + d x4, {a, b, c, d}, {x1, x2, x3, x4}]

I am receiving this error on passing the above command FindFit::fitc: Number of coordinates (3) is not equal to the number of variables (4).

Please let me know what I am doing wrong here ? I want to get coefficient values of x1,x2,x3 and x4.

2

Take a look at the “Fit a model to data in four dimensions:” example in the Scope / Multivariate Data section of the documentation.

3

Crossposted here.