1. **State the problem:** Calculate the summation $$\sum_{i=3}^{4} i$$ which means adding the values of $i$ from 3 to 4. 2. **Formula and explanation:** The summation $$\sum_{i=a}^{b} i$$ means $a + (a+1) + \cdots + b$. 3. **Evaluate the sum:** Here, $a=3$ and $b=4$, so we add $3 + 4$. 4. **Calculate:** $$3 + 4 = 7$$ 5. **Final answer:** The value of the summation is $$7$$.