How could Antonio get the money back in Merchant of Venice?

To answer the question we need to know what money and from what or whom.

Here's the situation: Antonio borrowed 3000 ducats from Shylock the moneylender. He hoped to repay it from the sales of the cargos of one of a number of ships he was expecting. The sale of the cargo from any one ship would have been enough to cover the loan. However, none of the ships came in on time. Is the question how Antonio might have got back the money from the lost ships? He couldn't; insurance had not yet been invented.

Also, Antonio gave the 3000 ducats he borrowed to his friend Bassanio who blew it all on chatting up Portia. He couldn't get the money back from Bassanio, at least not at the time he needed it.

Of course, later some of his ships came in late and Bassanio successfully married the rich Portia so he had money galore but by then it was too late--Shylock was already claiming his pound of flesh.