We are asked to find the volume of a rectangular prism. The formula for the volume of a rectangular prism is:
\[
\text{Volume} = \text{length} \times \text{width} \times \text{height}.
\]
In this problem, the given dimensions are:
- Length = 5 units,
- Width = 3 units,
- Height = 4 units.
Substitute the values into the formula:
\[
\text{Volume} = 5 \times 3 \times 4.
\]
Now, calculate the product:
\[
5 \times 3 = 15,
\text{and}
15 \times 4 = 60.
\]
Therefore, the volume of the rectangular prism is \( 60 \) cubic units.