What is the Dual formulation of the following LP model?

Objective Function:  Maximize Z = p*0*x1 + p*m*x2 + p*0*x3 + p*0*x4 + (1- p)*(1+r)*x4 + (1-p)*K ; Subject to x1 ≥ b1/Q ; x2 ≤ b2/Q ; x1 – 1.43*x2 ≥ 0 ; x1 – x3 ≤ 0 ; x1 – x4 ≤ 0 ; x3 = 200 ; x4 = 107 ; and x1, x2, x3, x4 ≥ 0 ; where, x1, x2, x3, x4 are decision variables ;