Three lines are drawn parallel to each of the three sides of $\triangle ABC$ so that the three lines intersect in the interior of $ABC$. The resulting three smaller triangles have areas $1$, $4$, and $9$. Find the area of $\triangle ABC$.

[asy]
defaultpen(linewidth(0.7)); size(120);
pair relpt(pair P, pair Q, real a, real b) { return (a*Q+b*P)/(a+b); }
pair B = (0,0), C = (1,0), A = (0.3, 0.8), D = relpt(relpt(A,B,3,3),relpt(A,C,3,3),1,2);
draw(A--B--C--cycle);
label("$A$",A,N); label("$B$",B,S); label("$C$",C,S);
filldraw(relpt(A,B,2,4)--relpt(A,B,3,3)--D--cycle, gray(0.7));
filldraw(relpt(A,C,1,5)--relpt(A,C,3,3)--D--cycle, gray(0.7));
filldraw(relpt(C,B,2,4)--relpt(B,C,1,5)--D--cycle, gray(0.7));[/asy]
1. Let the area of the smallest triangle be \(1\), the area of the medium triangle be \(4\), and the area of the largest triangle be \(9\). These triangles are similar to \(\triangle ABC\) and to each other because the lines are parallel to the sides of \(\triangle ABC\).

2. Let the side length of the smallest triangle be \(a\). Since the triangles are similar, the side length of the medium triangle is \(2a\) and the side length of the largest triangle is \(3a\).

3. The area of a triangle is proportional to the square of its side length. Therefore, the area of the smallest triangle is proportional to \(a^2\), the area of the medium triangle is proportional to \((2a)^2 = 4a^2\), and the area of the largest triangle is proportional to \((3a)^2 = 9a^2\).

4. Let the area of \(\triangle ABC\) be \(A\). The areas of the three smaller triangles are given as \(1\), \(4\), and \(9\). These areas are parts of the total area of \(\triangle ABC\).

5. The total area of \(\triangle ABC\) is the sum of the areas of the three smaller triangles and the area of the remaining part of \(\triangle ABC\). Let the area of the remaining part be \(x\).

6. Therefore, we have:
   \[
   A = 1 + 4 + 9 + x
   \]

7. The remaining part of \(\triangle ABC\) is also a triangle similar to \(\triangle ABC\) with side lengths proportional to \(3a\). The area of this remaining part is proportional to \((3a)^2 = 9a^2\).

8. Since the area of the largest triangle is \(9\), the area of the remaining part is also \(9\).

9. Therefore, we have:
   \[
   A = 1 + 4 + 9 + 9 = 23
   \]

10. However, this does not match the given areas. Let's re-evaluate the problem. The correct approach is to consider the ratios of the areas of the triangles.

11. The areas of the triangles are in the ratio \(1:4:9\). The total area of \(\triangle ABC\) is the sum of these areas plus the area of the remaining part.

12. Let the area of \(\triangle ABC\) be \(k\). The areas of the smaller triangles are \(k/36\), \(4k/36\), and \(9k/36\).

13. Therefore, we have:
   \[
   k = \frac{k}{36} + \frac{4k}{36} + \frac{9k}{36} + \frac{22k}{36}
   \]

14. Simplifying, we get:
   \[
   k = \frac{36k}{36}
   \]

15. Therefore, the area of \(\triangle ABC\) is \(36\).

The final answer is \(\boxed{36}\).