Finding the Third Proportional to 12,216 and 13,240

Step by Step Solution

1. Step 1: Write the proportion equation
   12,216 : 13,240 = 13,240 : x
2. Step 2: Convert to fraction form
   12,216/13,240 = 13,240/x
3. Step 3: Cross multiply
   12,216x = 13,240 × 13,240
4. Step 4: Simplify right side
   12,216x = 175,297,600
5. Step 5: Solve for x
   x = 175,297,600/12,216
6. Step 6: Final answer
   x = 14,349.84