[R] solving linear equations

[varunshivashankar]

I have a dataset 

X	Y1
1200	1.375
4000	0.464
1333.33	0.148
444.44	0.047
148.148	0.014
49.383	0.005
16.461	0.004

I have to find a curve fit for the above dataset based on a 4-parameter
logistic equation viz.

Y1 = d + ((a-d)/(1+(X/cc)^b)), where X and Y1 are the values above.

I need to know how to solve the above equation for values a, b, c, d.

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