if 18x10000 then x I need to determine the value of a missin

if 18=x/10000 then x=?
I need to determine the value of a missing factor.

I know the calculation that provides the rate:

Rate= Count/(Gallons/10000)

I am given the rate and the count or

3.028139= 12 /( x /10000)

I need to determine the number of gallons or vlaue of X

Any help would be appreciated.

Solution

R = C/(X/1000) Solve for X
R = C (1000/X) multiply by the reciprocal
R = 1000C/X
RX = 1000C Multiply both sides by X.
X = 1000C/R

X = (1000)(12)/3.028139

X = 3,962