$\overline{BC}$ is parallel to the segment through $A$, and $AB = BC$. What is the number of degrees represented by $x$?

[asy]
draw((0,0)--(10,0));
draw((0,3)--(10,3));
draw((2,3)--(8,0));
draw((2,3)--(4,0));
label("$A$",(2,3),N);
label("$B$",(4,0),S);
label("$C$",(8,0),S);
label("$124^{\circ}$",(2,3),SW);
label("$x^{\circ}$",(4.5,3),S);
[/asy]
Angle $\angle BCA$ and the angle we're trying to measure are alternate interior angles, so they are congruent. Thus, $\angle BCA=x^\circ$:

[asy]
draw((0,0)--(10,0));
draw((0,3)--(10,3));
draw((2,3)--(8,0));
draw((2,3)--(4,0));
label("$A$",(2,3),N);
label("$B$",(4,0),S);
label("$C$",(8,0),S);
label("$124^{\circ}$",(2,3),SW);
label("$x^{\circ}$",(4.5,3),S);
label("$x^{\circ}$",(6,0),N);
[/asy]

Since $AB=BC$, we know that $\triangle ABC$ is isosceles with equal angles at $C$ and $A$. Therefore, $\angle BAC = x^\circ$:

[asy]
draw((0,0)--(10,0));
draw((0,3)--(10,3));
draw((2,3)--(8,0));
draw((2,3)--(4,0));
label("$A$",(2,3),N);
label("$B$",(4,0),S);
label("$C$",(8,0),S);
label("$124^{\circ}$",(2,3),SW);
label("$x^{\circ}$",(4.5,3),S);
label("$x^{\circ}$",(6,0),N);
label("$x^{\circ}$",(3.6,1.7));
[/asy]

The sum of the three angles at $A$ is $180^\circ$, since they form a straight angle. Therefore, $$124+x+x=180,$$ which we can solve to obtain $x=\boxed{28}$.