Two Internally Tangent Circles, Third Inside the Outer One

Steps

1. We choose the reference circle for the inversion. Its center is chosen at the point of tangency of the given circles.
2. We apply the circular inversion to the given objects. The circle passing through the point of tangency is transformed into a line.
3. The first four solution circles are transformed into circles tangent to the images of the given circles. We find them using sets of points with given properties.
4. The remaining two solution circles are transformed into tangents to a circle parallel to the images of the given circles.
5. We invert the images of the solution circles back using the same inversion.
6. The problem has six solutions.