Eliana drove her car 81 \text{ km}81 km81, start text, space, k, m, end text and used 999 liters of fuel. She wants to know how many kilometers (x)(x)left parenthesis, x, right parenthesis she can drive on 222222 liters of fuel. She assumes her car will continue consuming fuel at the same rate.

how about typing some actual math, instead of all that word salad?

something along the lines of
81km/9L
and so on
Then form a proportion to find x