Declension table of ?prayojyatva

Neuter	Singular	Dual	Plural
Nominative	prayojyatvam	prayojyatve	prayojyatvāni
Vocative	prayojyatva	prayojyatve	prayojyatvāni
Accusative	prayojyatvam	prayojyatve	prayojyatvāni
Instrumental	prayojyatvena	prayojyatvābhyām	prayojyatvaiḥ
Dative	prayojyatvāya	prayojyatvābhyām	prayojyatvebhyaḥ
Ablative	prayojyatvāt	prayojyatvābhyām	prayojyatvebhyaḥ
Genitive	prayojyatvasya	prayojyatvayoḥ	prayojyatvānām
Locative	prayojyatve	prayojyatvayoḥ	prayojyatveṣu

Compound prayojyatva -

Adverb -prayojyatvam -prayojyatvāt