To calculate the ammount we have in an account after a certain time with an interes rate compound continuouly we have to use the formula:
where FV is the future value, P in the principal (the initial ammount we invest), e is the euler number (2.7182....), r is the interest rate in decimal form and t is the time.
Then, in our case we have:
Therefore, there will be $5084.35 in the account after 19 years.