Just use a calculator.
but if this is not a joke
the answer is 24.94
Xy=k, whenever the product of two variables is a constant it is called inverse variation. This is an inverse relationship, intuitively because, as the value of one variable increases, the other decreases and vice versa.
It is easy to spot as xy=k or y=k/x.
If $4.59 = 5.4 peanuts
$x = 7. 8 peanuts
Cross multiply and you get:
5.4x = (4.59)(7.8)
x = ((4.59)(7.8)) / 5.4
x = $6.63
Sas only because the triangles and usually congruent to me or in my opponion