ANSWER
12
Step-by-step explanation
Let 'n' be the missing number. We know that the product of the number, 17, and 19 is 3876, so we have the equation,
![n\cdot17\cdot19=3876](https://img.qammunity.org/2023/formulas/mathematics/college/fma1uw76zn9mg4ggejiclf8stbv2ok4huo.png)
Solve the product 17*19,
![n\cdot323=3876](https://img.qammunity.org/2023/formulas/mathematics/college/p5d9fbxbo2qci2fl54h81xzgsje69yuwj1.png)
And divide both sides by 323 to solve for n,
![\begin{gathered} (n\cdot323)/(323)=(3876)/(323) \\ \\ n=12 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/iiq4daxbvyotblaepumbn0bsbd4jv599gi.png)
Hence, the third number is 12.