When you get to Ayten in The Worlds part of the Kingdoms World, go to the inn called The Golden Plains.

Save your game and talk to Kellin Can the Fateweaver.

He will have as one option to play a game of dice. Make sure you have 1224 gold in your inventory.

Play a game of high roll. If you win, play again, if not, load the game and try again.

Keep going saving and loading until you have whatever sum you want.