Am i missing something or is there more to this question there , there seems.

The ballon with a certain mass wants to lift an iditional mass therefore the combinded mass of the baloon is 4246 Kg

The dnesity of Helium at STP is 0.18 kg/m^3

and the relationship describing density is :

D=M/V rearrange for volume and and get Volume= mass/ density

V=4246 kg/ 0.18kg/m^3

V=23588.89 m^3 which is wrong...what am i missing here??