Definition of "proportionably"

Happy is that man that hath so proportionably directed his estate, as his riches may discharge and supply the same, without care or encombrance to himselfe […].

1603, Michel de Montaigne, chapter 40, in John Florio, transl., The Essayes […], book I, London: […] Val[entine] Simmes for Edward Blount […]

It may at first appear strange, but I believe it is true, that I cannot by means of money raise a poor man and enable him to live much better than he did before, without proportionably depressing others in the same class.

1798, Thomas Malthus, An Essay on the Principle of Population, page 79