A line passing through the point $(1,1,1)$ intersects the line defined by
\[\begin{pmatrix} 1 \\ 2 \\ 3 \end{pmatrix} + t \begin{pmatrix} 2 \\ 3 \\ 4 \end{pmatrix}\]at $P,$ and intersects the line defined by
\[\begin{pmatrix} -2 \\ 3 \\ -1 \end{pmatrix} + s \begin{pmatrix} 1 \\ 2 \\ 4 \end{pmatrix}\]at $Q.$  Find point $Q.$
For the first line, $P = (2t + 1, 3t + 2, 4t + 3).$  For the second line, $Q = (s - 2, 2s + 3, 4s - 1).$

Since $(1,1,1),$ $P,$ and $Q$ are collinear, the vectors
\[\begin{pmatrix} 2t + 1 \\ 3t + 2 \\ 4t + 3 \end{pmatrix} - \begin{pmatrix} 1 \\ 1 \\ 1 \end{pmatrix} = \begin{pmatrix} 2t \\ 3t + 1 \\ 4t + 2 \end{pmatrix}\]and
\[\begin{pmatrix} s - 2 \\ 2s + 3 \\ 4s - 1 \end{pmatrix} - \begin{pmatrix} 1 \\ 1 \\ 1 \end{pmatrix} = \begin{pmatrix} s - 3 \\ 2s + 2 \\ 4s - 2 \end{pmatrix}\]will be proportional.  Thus,
\[\frac{2t}{s - 3} = \frac{3t + 1}{2s + 2} = \frac{4t + 2}{4s - 2}.\]Let
\[k = \frac{2t}{s - 3} = \frac{3t + 1}{2s + 2} = \frac{4t + 2}{4s - 2}.\]Then
\begin{align*}
2t &= k(s - 3), \\
3t + 1 &= k(2s + 2), \\
4t + 2 &= k(4s - 2).
\end{align*}From the first equation, $4t = k(2s - 6).$  Subtracting from the equation $4t + 2 = k(4s - 2),$ we get
\[2 = k(2s + 4).\]From the second equation, $6t + 2 = k(4s + 4).$  Subtracting the equation $4t + 2 = k(4s - 2),$ we get
\[2t = 6k,\]so $t = 3k.$  Substituting into the first equation, we get $6k = k(s - 3).$

If $k = 0,$ then from the equations above,
\[2t = 3t + 1 = 4t + 2 = 0,\]which is not possible.  So $k \neq 0,$ which gives us $6 = s - 3,$ and $s = 9.$  Then $Q = \boxed{(7,21,35)}.$