If you cannot afford to raise the demanded funds you can intimate him about it expressing your helplessness in this regard.
He cannot take any action violating the rules and conditions of articles of association or memorandum or association or even the partnership agreement..
You are silent about the conditions of the partnership deed in this regard.
When partners fall out, the ownership, control, and even survival of their company are threatened.
In your situation the dominating partner is trying to take an advantage over your helplessness to raise additional funds.
A statement of control signed by all partners should specify what will happen if a lesser partner doesn’t agree with the controlling partner. The lesser partner may have the right to leave, for example, and to have his or her equity bought out at a predetermined formula price. Or there may be a formula whereby the company can buy out a lesser partner who doesn’t abide by the controlling partner’s decisions.
The company’s ongoing leadership can be determined by merit at least this arrangement has a better chance of working than if the question of leadership were decided between rivals.
You may rope in a chartered accountant and have a group discussion for way forward overcoming the current crisis on the basis of the partnership agreement and the conditions of AOA..