Answer:
[tex]\$1583.33[/tex]
Step-by-step explanation:
Let [tex]d[/tex] be the amount of money you need to save each month to have the full $23,000.
We can write the following inequality:
[tex]4,000+12d\geq 23,000[/tex]
Solving for [tex]d[/tex]:
[tex]4,000+12d\geq 23,000,\\12d\geq 19,000\\d\geq \approx \boxed{\$1583.33}[/tex]