To find the amount of money in the bank at the end of 5 years using the formula \( f(x) = 4000(1.06)^x \), we need to evaluate \( f(5) \).
Substituting \( x = 5 \) into the formula:
\[ f(5) = 4000(1.06)^5 \]
Now, let's calculate \( (1.06)^5 \).
\[ (1.06)^5 \approx 1.338225 \]
Now, multiply this by 4000:
\[ f(5) = 4000 \times 1.338225 \approx 5353.00 \]
Thus, rounding to the nearest cent, we find:
\[ f(5) \approx 5353.00 \]
Therefore, the amount of money in the bank at the end of 5 years is:
\[ \boxed{5353.00} \]