Solutions by everydaycalculation.com
1st number: 16/21, 2nd number: 1 1/7
1621 + 87 is 4021.
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Related: 32/21+8/7 16/21+16/7 16/42+8/7 16/21+8/14 48/21+8/7 16/21+24/7 16/63+8/7 16/21+8/21 80/21+8/7 16/21+40/7 16/21+8/35 16/21+56/7 16/21+8/49
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