How do you create an exponential function y=ab^x given (21200) and (23.392)?

##y=1*1.00014871^x##
##23.392=a*b^21200##
There are two variables so I’ll assign 1 to a
##23.392=1*b^21200->##
##23.392^(1/21200)=(b^21200)^(1/21200)->##
##1.00014871=b##
So the equation is
##y=1*1.00014871^x##