Finding the Third Proportional to 8,216 and 12,700

Step by Step Solution

1. Step 1: Write the proportion equation
   8,216 : 12,700 = 12,700 : x
2. Step 2: Convert to fraction form
   8,216/12,700 = 12,700/x
3. Step 3: Cross multiply
   8,216x = 12,700 × 12,700
4. Step 4: Simplify right side
   8,216x = 161,290,000
5. Step 5: Solve for x
   x = 161,290,000/8,216
6. Step 6: Final answer
   x = 19,631.21