I am not sure if there is an equation to approach the value

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I am not sure if there is an equation to approach the value
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My cousin was doing some maths, but he did not have any idea how to resolve it.
I don't know equation, so I post it here and hope someone kindly help him figure out if there is an equation that can approximate the value of X.

Here are the results but with an unkown value x: When

Altitude (y) = 0.119, f(y) = 4.9
Altitude (y) = 0.1199, f(y) = 4.99
Altitude (y) = 0.11999, f(y) = 4.999
Altitude (y) = 0.12, f(y) = x
Altitude (y) = 0.12001, f(y) = 5.001

What is the value of x?

This is my first time posting a maths question in this forum, please forgive me if my questions violate the rules.

Thank you.
 
There are infinitely many approximations. You must pick one. It is typical to start with a scatter plot and get SOME idea what you are seeing. You will need a very specific scale.
 
As TKHunny said, there are an infinite number of "correct" answers to this, but there is one easy and obvious answer! Take a guess.
 
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