Inside the quadrangle, a point is taken and connected with the midpoint of all sides. Areas of the three out of four formed quadrangles are $S_1, S_2, S_3$. Find the area of the fourth quadrangle.
1. **Understanding the Problem:**
   We are given a quadrilateral with a point inside it. This point is connected to the midpoints of all four sides, forming four smaller quadrilaterals. We know the areas of three of these quadrilaterals, denoted as \( S_1, S_2, \) and \( S_3 \). We need to find the area of the fourth quadrilateral, denoted as \( S_4 \).

2. **Using the Shoelace Method:**
   The Shoelace Theorem (or Gauss's area formula) is typically used to find the area of a polygon when the coordinates of its vertices are known. However, in this problem, we are dealing with areas directly. The key insight here is that the sum of the areas of opposite quadrilaterals formed by connecting the midpoints of the sides of the original quadrilateral is equal.

3. **Setting Up the Equation:**
   Let the areas of the four quadrilaterals be \( S_1, S_2, S_3, \) and \( S_4 \). According to the problem, we have:
   \[
   S_1 + S_4 = S_2 + S_3
   \]

4. **Solving for \( S_4 \):**
   We can rearrange the equation to solve for \( S_4 \):
   \[
   S_4 = S_2 + S_3 - S_1
   \]

5. **Conclusion:**
   The area of the fourth quadrilateral \( S_4 \) can be found using the areas of the other three quadrilaterals.

The final answer is \( \boxed{ S_4 = S_2 + S_3 - S_1 } \).