Express in simplest form with a rational denominator. $$ \frac{3}{\sqrt{28}} $$

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To express $$\frac{3}{\sqrt{28}}$$ in its simplest form with a rational denominator, follow these steps:

1. **Simplify $$\sqrt{28}$$:**
   $$
   \sqrt{28} = \sqrt{4 \times 7} = 2\sqrt{7}
   $$
   
2. **Rewrite the original expression:**
   $$
   \frac{3}{\sqrt{28}} = \frac{3}{2\sqrt{7}}
   $$
   
3. **Rationalize the denominator by multiplying the numerator and the denominator by $$\sqrt{7}$$:**
   $$
   \frac{3}{2\sqrt{7}} \times \frac{\sqrt{7}}{\sqrt{7}} = \frac{3\sqrt{7}}{2 \times 7} = \frac{3\sqrt{7}}{14}
   $$
   
So, the expression in its simplest form with a rational denominator is:

$$
\frac{3\sqrt{7}}{14}
$$

**Answer:**
$$\frac{3\,\sqrt{7}}{14}$$
$$\frac{3\sqrt{7}}{14}$$

Express in simplest form with a rational
denominator.

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