Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word proportionum could not be parsed. Trying a normal dictionary lookup:
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prōportĭōnābĭlĭter, adv. [lengthened form of proportionaliter], proportionally, Boëth. 1 Geom. p. 1206.
prōportĭōnālis, e, adj. [proportio], of or belonging to proportion, proportional (post-class.): termini, Front. Colon. p. 111.
Hence, prōportĭōnālĭter, adv., proportionally, Cassiod. Geom. 6.
prōportĭōnālĭtas, ātis, f. [proportionalis], proportion, Boëth. 2 Arithm. 40.
prōportĭōnātus, a, um, adj. [proportio], proportioned, proportionate (postclass.): corpus, Firm. Math. 4, 13.