If start date is in A1 and positive number of business days in B1

=SMALL(IF(WEEKDAY(A1+ROW(INDIRECT("1:"&B1*3))-1)={2,4,6},A1+ROW(INDIRECT("1:"&B1*3))-1),B1)

confirmed with CTRL+SHIFT+ENTER

note that {2,4,6} refers to Mon, Wed and Fri. Adjust accordingly for
other combinations


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daddylonglegs
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