Depends on the variety of the goldfish, how long it must live in that tank, the average temp of the tank, the other species in the tank, the gallonage, etc. Honestly, most commons and the stronger fancies are very hardy and will do just fine in warmer waters, though it will increase their fecal output and oxygen needs. My concern would more be the other inhabitants of your tank, since goldfish stress the bioload immensely, produce tons of ammonia, require a great deal of oxygen, and are notorious fin nippers. So, unless the topical tank has a very strong filter, a very good aerator, is plenty large, and has fish who can take care of themselves, I'd suggest looking at flea markets and classifieds for a good deal on a tank ASAP. In the mean time, carefully monitor the ammonia levels and other water stats.
An alternate solution that, IMHO, is safer for all fish involved would be to buy a large storage bin - somewhere from 30-70g depending on the size of the fish and strength of the filter - and attach the old filter and bubbler from the broken tank, then place the goldies in there. You can get such bins ever cheaply, usually under $20, and it will keep the goldfish in cooler water, prevent a decline in water quality in your tropical tank, etc.
