A business has a netloss of $419.18 Does that mean the breakeven is 419.18?

No. The break-even is always equal to zero, meaning you did not lose money or make money, you just broke-even.

It means that everything the business took in was $419.18 less than everything it spent to be in business during the same period of time. It doesn't tell you what either of those amounts was. Just the difference between them.