De or het rapportering?

The correct Dutch article is:

de rapportering

Rule Words ending in -ing: almost always de. See the rule

How to use rapportering

the rapporteringde rapportering
this rapporteringdeze rapportering
that rapporteringdie rapportering
our rapporteringonze rapportering
your rapporteringjouw rapportering
every rapporteringelke rapportering
which rapportering?welke rapportering?
a big rapportering / the big rapporteringeen grote rapportering, de grote rapportering

Dutch words ending in rapportering

kwartaalrapportering

In compound words, the last part decides the article. See the rule