Find all real numbers $a$ such that $4 < a < 5$ and $a(a-3\{a\})$ is an integer. ({x} represents the fractional part of x)
1. We start with the given conditions: \(4 < a < 5\) and \(a(a - 3\{a\})\) is an integer. Here, \(\{a\}\) represents the fractional part of \(a\).

2. Since \(4 < a < 5\), we can write \(a\) as \(a = 4 + \{a\}\), where \(0 < \{a\} < 1\).

3. Substitute \(a = 4 + \{a\}\) into the expression \(a(a - 3\{a\})\):
   \[
   a(a - 3\{a\}) = (4 + \{a\})((4 + \{a\}) - 3\{a\}) = (4 + \{a\})(4 - 2\{a\})
   \]

4. Expand the expression:
   \[
   (4 + \{a\})(4 - 2\{a\}) = 16 - 8\{a\} + 4\{a\} - 2\{a\}^2 = 16 - 4\{a\} - 2\{a\}^2
   \]

5. Let \(k\) be the integer value of \(a(a - 3\{a\})\):
   \[
   16 - 4\{a\} - 2\{a\}^2 = k
   \]

6. Rearrange the equation to form a quadratic in \(\{a\}\):
   \[
   2\{a\}^2 + 4\{a\} + k - 16 = 0
   \]

7. Solve for \(\{a\}\) using the quadratic formula \(\{a\} = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\):
   \[
   \{a\} = \frac{-4 \pm \sqrt{16 - 8(k - 16)}}{4} = \frac{-4 \pm \sqrt{128 - 8k}}{4} = \frac{-4 \pm 2\sqrt{32 - k}}{4} = \frac{-2 \pm \sqrt{32 - k}}{2}
   \]

8. Since \(0 < \{a\} < 1\), we have:
   \[
   0 < \frac{-2 + \sqrt{32 - k}}{2} < 1
   \]

9. Simplify the inequality:
   \[
   0 < -2 + \sqrt{32 - k} < 2
   \]

10. Add 2 to all parts of the inequality:
    \[
    2 < \sqrt{32 - k} < 4
    \]

11. Square all parts of the inequality:
    \[
    4 < 32 - k < 16
    \]

12. Rearrange to find \(k\):
    \[
    16 > k > 18 - 16 \implies 16 > k > 10
    \]

13. Since \(k\) must be an integer, \(k\) can be \(11, 12, 13, 14, 15\).

14. Substitute each \(k\) back into the quadratic formula to find \(\{a\}\):
    \[
    \{a\} = \frac{-2 + \sqrt{32 - k}}{2}
    \]

15. Calculate \(\{a\}\) for each \(k\):
    - For \(k = 11\): \(\{a\} = \frac{-2 + \sqrt{21}}{2}\)
    - For \(k = 12\): \(\{a\} = \frac{-2 + \sqrt{20}}{2} = \frac{-2 + 2\sqrt{5}}{2} = -1 + \sqrt{5}\)
    - For \(k = 13\): \(\{a\} = \frac{-2 + \sqrt{19}}{2}\)
    - For \(k = 14\): \(\{a\} = \frac{-2 + \sqrt{18}}{2} = \frac{-2 + 3\sqrt{2}}{2} = -1 + \frac{3\sqrt{2}}{2}\)
    - For \(k = 15\): \(\{a\} = \frac{-2 + \sqrt{17}}{2}\)

16. Calculate \(a\) for each \(\{a\}\):
    - For \(k = 11\): \(a = 4 + \frac{-2 + \sqrt{21}}{2} = 3 + \frac{\sqrt{21}}{2}\)
    - For \(k = 12\): \(a = 4 + (-1 + \sqrt{5}) = 3 + \sqrt{5}\)
    - For \(k = 13\): \(a = 4 + \frac{-2 + \sqrt{19}}{2} = 3 + \frac{\sqrt{19}}{2}\)
    - For \(k = 14\): \(a = 4 + (-1 + \frac{3\sqrt{2}}{2}) = 3 + \frac{3\sqrt{2}}{2}\)
    - For \(k = 15\): \(a = 4 + \frac{-2 + \sqrt{17}}{2} = 3 + \frac{\sqrt{17}}{2}\)

17. The valid solutions for \(a\) are:
    \[
    a \in \left\{ 3 + \frac{\sqrt{21}}{2}, 3 + \sqrt{5}, 3 + \frac{\sqrt{19}}{2}, 3 + \frac{3\sqrt{2}}{2}, 3 + \frac{\sqrt{17}}{2} \right\}
    \]

The final answer is \( \boxed{ \left\{ 3 + \frac{\sqrt{21}}{2}, 3 + \sqrt{5}, 3 + \frac{\sqrt{19}}{2}, 3 + \frac{3\sqrt{2}}{2}, 3 + \frac{\sqrt{17}}{2} \right\} } \)