Declension table of ?prayojakatva

Neuter	Singular	Dual	Plural
Nominative	prayojakatvam	prayojakatve	prayojakatvāni
Vocative	prayojakatva	prayojakatve	prayojakatvāni
Accusative	prayojakatvam	prayojakatve	prayojakatvāni
Instrumental	prayojakatvena	prayojakatvābhyām	prayojakatvaiḥ
Dative	prayojakatvāya	prayojakatvābhyām	prayojakatvebhyaḥ
Ablative	prayojakatvāt	prayojakatvābhyām	prayojakatvebhyaḥ
Genitive	prayojakatvasya	prayojakatvayoḥ	prayojakatvānām
Locative	prayojakatve	prayojakatvayoḥ	prayojakatveṣu

Compound prayojakatva -

Adverb -prayojakatvam -prayojakatvāt