Finding the Third Proportional to 2,120 and 3,216

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120 : 3,216 = 3,216 : x
2. Step 2: Convert to fraction form
   2,120/3,216 = 3,216/x
3. Step 3: Cross multiply
   2,120x = 3,216 × 3,216
4. Step 4: Simplify right side
   2,120x = 10,342,656
5. Step 5: Solve for x
   x = 10,342,656/2,120
6. Step 6: Final answer
   x = 4,878.61