To find the length \( d \) given the dimensions \( l = 30 \) in, \( w = 20 \) in, \( h = 18 \) in, and \( x = 36.1 \) in, we can use the 3D distance formula if \( d \) represents the distance from a point in 3D space.
Assuming \( d \) is the space diagonal of a rectangular box defined by the dimensions \( l, w, h \), the formula for the space diagonal \( d \) is given by:
\[ d = \sqrt{l^2 + w^2 + h^2} \]
Substituting the provided values:
\[ d = \sqrt{30^2 + 20^2 + 18^2} \]
Calculating each term:
\[ 30^2 = 900 \] \[ 20^2 = 400 \] \[ 18^2 = 324 \]
Now adding these values together:
\[ d = \sqrt{900 + 400 + 324} = \sqrt{1624} \]
Finally, calculating the square root:
\[ d \approx 40.3 \text{ in} \]
Therefore, the length of \( d \) rounded to the nearest tenth is:
\[ \boxed{40.3} \text{ in} \]
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