To find the price per fluid ounce of the paint, we first need to know how many fluid ounces are in 3 cups.
1 cup is equal to 8 fluid ounces, so:
\[ 3 \text{ cups} \times 8 \text{ fluid ounces/cup} = 24 \text{ fluid ounces} \]
Now that we know there are 24 fluid ounces in 3 cups, we can calculate the price per fluid ounce:
\[ \text{Price per fluid ounce} = \frac{\text{Total cost}}{\text{Total fluid ounces}} = \frac{5.28}{24} \]
Now we perform the division:
\[ \frac{5.28}{24} = 0.22 \]
Thus, the price per fluid ounce is:
\[ \boxed{0.22} \]