What is the missing angle in a system of concurrent parallel forces?

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kgbwolf
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I have a problem where i have found the angle for one line but i can't find the angle for the other. See attached picture i couldn't find how to add the picture to the post without a url for it. so far i have the x and y values for two line I am only missing the third line.
f1 = 1570 lb ^x 0 lb ^y
f2 = 532 lb ^x 1740 ^y i got 17 degrees as an angle for this line
fr=
attachment.php?attachmentid=6167&stc=1&d=1138338660.jpg
 

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without the angle i wouldn't be able to add Fr it would be FRCOs? FrSIn? how am i supposed to add that??
 
add the x components of the first two vectors (this is the x component of the Fr vector)

add the y components

these two are your components of the Fr vector