What is the value of X in the mathematical problem 1870 = 1.2x (1 + (x-1000) / 2000) ∧ 1.6 Such as the title

one thousand two hundred and seventy-one point three three two five nine three

X * 1.2 * (1 + (x-1000) / 2000) ^ 1.6 = 3064 find x from the formula

Numerical solution with MATLAB
syms X
solve('X*1.2*(1+(X-1000)/2000)^1.6=3064')
Available
X=1638.7606

1.2 * x * (1 + (x-1000) / 2000) ^ 1.6 = 4158 finding x... Is not good for mathematics

x = 1905.904400

What is 1000 / 15% [(1 + 15%) ^ 10-1 / 15% (1 + 15%) ^ 10-10 / (1 + 15%) ^ 10] equal to?

1000/15%*[(1+15%)^10-1/15%*(1+15%)^10-10/(1+15%)^10]=-169311.16

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