I learnt that women got menstruation for taking 1/4th of Indra's sin of Brahmahatya. What curse did the other three entities get?
This is partially addressed here in this question .
The story of Indra killing Vishwroopa is described in Bhagavatam Canto 6.
Curse for Earth/Land:SB 6.9.7
In return for King Indra’s benediction that ditches in the earth would be filled automatically, the land accepted one fourth of the sinful reactions for killing a brāhmaṇa. Because of those sinful reactions, we find many deserts on the surface of the earth.
Curse for trees:SB 6.9.8
In return for Indra’s benediction that their branches and twigs would grow back when trimmed, the trees accepted one fourth of the reactions for killing a brāhmaṇa. These reactions are visible in the flowing of sap from trees. [Therefore one is forbidden to drink this sap.]
Curse for water:SB 6.9.10
And in return for King Indra’s benediction that water would increase the volume of other substances with which it was mixed, water accepted one fourth of the sinful reactions. Therefore there are bubbles and foam in water. When one collects water, these should be avoided.