Find tension using sum of torque (two strings, one beam, one box)

Here's the picture of the situation described, provided by the question.


Here's a screenshot of the work I have done.


Here's a screenshot of the submission screen.


The issue is that I have one attempt left and am not sure what I am doing wrong. Based on the hints, I feel like I'm calculating it right and using the right significant figures but it's just not accepting my answer (which is strange because usually it doesn't care about significant figures). I submitted 49363.63 and was shown the incorrect message above telling me to round to 3 significant figure so I submitted 49400 and got the same message. I feel like there's got to be something really obvious I'm missing or a concept that I am not applying. I'd really appreciate the help! Thanks in advance

You have a sign error going from eqn 2 to eqn 3 (##F_{TA}=##).

haruspex said:

You have a sign error going from eqn 2 to eqn 3 (##F_{TA}=##).

Haha I see it! Thank you so much