parseFloat does not return accurate value in Javascript

Question

I have an application which read API return string from a website and compare it to a value to see if it is greater or equal to particular float, the API return two float String which is "2366.5876" and "4067.4076" which when we add up equal to 6433.9952

But what I tried on Javascript provide different result:

cumulative = 0;
cumulative += parseFloat("2366.5876")
cumulative += parseFloat("4067.4076")
//here it return 6433.995199999999 instead of 6433.9952 . Why??

which when I compare to 6433.9952 , produce false which is not intended

cumulative >= 6433.9952 //False ???

Can I know how can I solve this??