How to update w4 to get a bigger paycheck?

[az148]

I want to update my w4 to get a bigger paycheck, what should I input for Line 3 or Line 4? I used the IRS Estimator tool and it's telling me to put $4,834 for Line 3. Does anyone know how they came up with that calculation? I understand that Line 4 you are able to specify if you want to withhold MORE taxes which doesn't apply to me. 

Expected tax withholding $3,698

Anticipated tax obligation* $1,913

Projected refund $1,785

IRS tool telling me to input $4834 on line 3

[rjs]

Duplicate question. Please post your question only once.

[az148]

apologies about that, my internet connection kept dropping so I wasn't sure if the question successfully posted or not. i was trying to delete the question but didnt see the option to do so. 

Are you able to help with answering the question?