Finding the Third Proportional to 3,121.50 and 3,216

Step by Step Solution

1. Step 1: Write the proportion equation
   3,121.50 : 3,216 = 3,216 : x
2. Step 2: Convert to fraction form
   3,121.50/3,216 = 3,216/x
3. Step 3: Cross multiply
   3,121.50x = 3,216 × 3,216
4. Step 4: Simplify right side
   3,121.50x = 10,342,656
5. Step 5: Solve for x
   x = 10,342,656/3,121.50
6. Step 6: Final answer
   x = 3,313.36