Ben, Dan, and Lilli were partners sharing profits in proportions of one-fourth, one-third, and five-twelfths, respectively. Their business failed, and the firm was dissolved. At the time of dissolution, no financial adjustments between the partners were necessary with reference to their respective partners' accounts, but the firm's liabilities to creditors exceeded its assets by $24,000. Without contributing any amount toward the payment of the liabilities, Dan moved to a destination unknown. Ben and Lilli are financially responsible. How much must each contribute?