I think you were already provided with a solution here.
But here it goes again:
y0 = 100_000
spl = Spline1D(x, y .- y0)
x0 = roots(spl) # 2.49089
I think you were already provided with a solution here.
But here it goes again:
y0 = 100_000
spl = Spline1D(x, y .- y0)
x0 = roots(spl) # 2.49089