elevant information for different soil layers are given below:

Soil Layer Thickness $($m$)$

Fine sand X $=2\mathrm{.}49$

Clay Y $=2\mathrm{.}37$

Coarse sand Z $=6\mathrm{.}43$

The depth of the water table, Dw $=1\mathrm{.}26$ m$.$

A foundation load causes a stress increase of $55\mathrm{.}25$ kPa at a depth of $1\mathrm{.}84$ m$.$

What is the change in vertical effective stress $($in kPa$)$ at a depth of $1\mathrm{.}84$ m immediately after the application of the foundation loading?