This Application Problem is a part of the Lesson 3, Unit 8, Grade 2. Three sides of a quadrilateral have the following lengths: 19 cm, 23 cm, and 26 cm. If the total distance around the shape is 86 cm, what is the length of the fourth side? This problem allows students to solve a two-step measurement word problem involving length in the context of geometric shapes using the RDW process.