。
Everything turned out just fine.
Literal
All-things favorably [adverbial-に] went.
好都合 ('convenient, favorable') is a na-adjective; the adverbial form 好都合に means 'favorably, advantageously.' Pairing it with いく gives a slightly more formal register than the colloquial うまくいった for 'things went well.' Common in business reports and reflective summaries of how something unfolded.