Let $ABC$ a acute triangle.

(a) Find the locus of all the points $P$ such that, calling $O_{a}, O_{b}, O_{c}$ the circumcenters of $PBC$, $PAC$, $PAB$:
\[\frac{ O_{a}O_{b}}{AB}= \frac{ O_{b}O_{c}}{BC}=\frac{ O_{c}O_{a}}{CA}\]

(b) For all points $P$ of the locus in (a), show that the lines $AO_{a}$, $BO_{b}$ , $CO_{c}$ are cuncurrent (in $X$);

(c) Show that the power of $X$ wrt the circumcircle of $ABC$ is:
\[-\frac{ a^{2}+b^{2}+c^{2}-5R^{2}}4\]
Where $a=BC$ , $b=AC$ and $c=AB$.
### Part (a)
1. **Define the circumcenters**: Let \( O_a \), \( O_b \), and \( O_c \) be the circumcenters of triangles \( PBC \), \( PAC \), and \( PAB \) respectively.
2. **Establish the similarity condition**: We need to show that the triangles \( O_aO_bO_c \) and \( ABC \) are similar. This implies that the angles between corresponding sides are equal.
3. **Use cyclic quadrilaterals**: Note that quadrilateral \( NPMO_c \) is cyclic, where \( M \) is the midpoint of \( AP \), \( N \) is the midpoint of \( PB \), and \( L \) is the midpoint of \( PC \). This cyclic property gives us:
   \[
   \angle O_bO_cO_a = 180^\circ - \angle APB
   \]
4. **Symmetry and locus**: Since \( P \) must lie on the symmetric of the circumcircle of \( \triangle ABC \) with respect to \( AB \), \( BC \), and \( CA \), and these three circles intersect at the orthocenter \( H \) of \( \triangle ABC \), the locus of \( P \) is the orthocenter \( H \).

### Part (b)
1. **Concurrent lines**: For all points \( P \) on the locus found in part (a), we need to show that the lines \( AO_a \), \( BO_b \), and \( CO_c \) are concurrent.
2. **Orthocenter and circumcenter relationship**: The orthocenter \( H \) of \( \triangle ABC \) is the circumcenter of \( \triangle O_aO_bO_c \). This implies that the circle passing through \( M \), \( L \), and \( N \) is the nine-point circle (Feuerbach circle) of both \( \triangle ABC \) and \( \triangle O_aO_bO_c \).
3. **Homothety**: Since \( \triangle ABC \) and \( \triangle O_aO_bO_c \) are similar and share the same nine-point circle, they are homothetic with the homothetic center at the center of the nine-point circle. Therefore, the lines \( AO_a \), \( BO_b \), and \( CO_c \) are concurrent.

### Part (c)
1. **Power of point \( X \)**: We need to find the power of point \( X \) with respect to the circumcircle of \( \triangle ABC \).
2. **Power of a point formula**: The power of a point \( X \) with respect to a circle with radius \( R \) and center \( O \) is given by:
   \[
   \text{Power}_\Gamma(X) = R^2 - XO^2
   \]
3. **Distance calculation**: Since \( X \) is the orthocenter \( H \) of \( \triangle ABC \), we use the known formula for the distance from the orthocenter to the circumcenter:
   \[
   OH^2 = 9R^2 - a^2 - b^2 - c^2
   \]
4. **Substitute and simplify**:
   \[
   \text{Power}_\Gamma(H) = R^2 - \frac{9R^2 - a^2 - b^2 - c^2}{4} = \frac{4R^2 - (9R^2 - a^2 - b^2 - c^2)}{4} = \frac{a^2 + b^2 + c^2 - 5R^2}{4}
   \]

The final answer is \(\boxed{\frac{a^2 + b^2 + c^2 - 5R^2}{4}}\)