Voltage in a circuit at a particular point
I'll redraw it to see if that helps you:



simulate this circuit &ndash; Schematic created using CircuitLab
There are only two unknown node voltages: \$V_x\$ and \$V_y\$. I think you are saying that you want to find \$V_x\$.
You should be able to work out that \$I_1=I_2+I_3\$, for example. And also that while \$V_y=I_1\cdot R_1\$ (because that's how to compute the voltage drop across a resistor when you know the current through it), you should also be able to work out that \$V_y=6\:\text{V}-I_2\cdot R_2=6\:\text{V}-I_3\cdot\left( R_3+R_4\right)\cdot\$.
If you are savvy enough, you might notice that \$R_2\$ appears to be in parallel with \$R_3+R_4\$ and use that fact to help simplify the schematic a bit and work out the value of \$I_1\$ from that.