Finding the Third Proportional to 8,214 and 12,456

Step by Step Solution

1. Step 1: Write the proportion equation
   8,214 : 12,456 = 12,456 : x
2. Step 2: Convert to fraction form
   8,214/12,456 = 12,456/x
3. Step 3: Cross multiply
   8,214x = 12,456 × 12,456
4. Step 4: Simplify right side
   8,214x = 155,151,936
5. Step 5: Solve for x
   x = 155,151,936/8,214
6. Step 6: Final answer
   x = 18,888.72