The inductance of a coil is measured using the bridge shown in the figure. Balance (D = 0) is obtained with C₁ = 1 nF, R₁ = 2.2 MΩ, R₂ = 22.2 kΩ, R₄ = 10 kΩ. The value of the inductance L_x (in mH) is ______.

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The inductance of a coil is measured using the bridge shown in the figure. Balance (D = 0) is obtained with C1 = 1 nF, R1 = 2.2 MΩ, R2 = 22.2 kΩ, R4 = 10 kΩ. The value of the inductance Lx (in mH) is ______.