Microsoft Excel - how can i determine root coefficient (a,b,c,d,e)of polynomial fourth degree with excel?

ax^4+bx^3+cx^2+dx+e
a=?
b=?
c=?
d=?
e=?                              
                                         
                                          

my data                  x               2.27

4.59

6.55

8.38

9.7

y:

1.934

2.045

2.100

2.096

2.056

a = .00005    = x^4 coefficient
b = -.00162   = x^3 coefficient
c = .01098     = x^2 coefficient
d = .02301     = x^1 coefficient
e = 1.84281   = x^0 coefficient

Using Excel plot and trendline, equation overlay
When x = 0   y = e
When x = 7.347 and y = 2.106 = first derivative
Area under the curve = 15.3125