To find the volume \( V \) of a rectangular prism, you can use the formula:
\[ V = \text{length} \times \text{width} \times \text{height} \]
Given:
- Length = 423 ft
- Width = 212 ft
- Height = 313 ft
Now calculate the volume:
\[ V = 423 \times 212 \times 313 \]
First, calculate \( 423 \times 212 \):
\[ 423 \times 212 = 89796 \]
Now multiply by the height:
\[ 89796 \times 313 = 28,097,988 \]
Now to express this in mixed number form. Since \( 28,097,988 \) is a whole number, it does not have a fractional part. In mixed number form, it is simply:
\[ 28,097,988 \text{ ft}^3 \]
Therefore, the volume of the rectangular prism is:
\[ \boxed{28,097,988 \text{ ft}^3} \]