Help with solving this fillet

 From:  WN 17 Mar 2021  (4 of 6) 
10234.4 
Something like that.

I also made it in 123D Design, where it is much easier and faster.

https://disk.yandex.ru/d/eHtdRWwMOE_RDA
https://disk.yandex.ru/d/pnlH99uXbUUyPQ
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