During hydrothermal treatment (soaking) of rough rice at $60^\circ\text{C}$, the water absorption kinetics follow Peleg's equation: $M_t = M_0 + \frac{t}{k_1 + k_2 t}$, where $M$ is moisture content in dry basis ($\text{g water / g dry matter}$) and $t$ is soaking time in hours. The initial moisture content is $M_0 = 0.14\text{ g/g db}$. The kinetic parameters are $k_1 = 12.5\text{ h}\cdot\text{g db / g water}$ and $k_2 = 1.80\text{ g db / g water}$. The moisture content ($M_t$) of paddy after $4.0\text{ hours}$ of soaking is ________ $\text{g/g db}$ (round off to three decimal places).