Four long straight wires are perpendicular to the page, and their cross sections

Question

Four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 14.5 cm. Each wire carries 3.50 A, and the currents are out of the page in wires 1 and 4 and into the page in wires 2 and 3. In unit-vector notation, what is the net magnetic force per meter of wire length on wire 4?

I can't figure out how to paste the image on here, but the wires are arranged in a square like so:

1-----2

4-----3

I am able to find the magnitudes on wire 4 from the other 3 wires but am having difficulty getting the correct answer when it comes to the unit vector part. Thanks in advance for any help!

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