Hello, i need help with this question. I guaranteed a thumbs up for the correct answer.

Suppose you have a portfolio that has $70 in stock A with a beta of 0.82,$280 in stock B with a beta of 1.12, and $210 in the risk-free asset. You have another $140 to invest. You wish to achieve a beta for your whole portfolio to be the same as the market beta. What is the beta of the added security? (Round intermediate calculations and the final answer to 3 decimal places, e.g. 2.361.)