Finding the Third Proportional to 2,212 and 5,215

Step by Step Solution

1. Step 1: Write the proportion equation
   2,212 : 5,215 = 5,215 : x
2. Step 2: Convert to fraction form
   2,212/5,215 = 5,215/x
3. Step 3: Cross multiply
   2,212x = 5,215 × 5,215
4. Step 4: Simplify right side
   2,212x = 27,196,225
5. Step 5: Solve for x
   x = 27,196,225/2,212
6. Step 6: Final answer
   x = 12,294.86