Finding the Third Proportional to 8,388 and 12,979.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,388 : 12,979.50 = 12,979.50 : x
2. Step 2: Convert to fraction form
   8,388/12,979.50 = 12,979.50/x
3. Step 3: Cross multiply
   8,388x = 12,979.50 × 12,979.50
4. Step 4: Simplify right side
   8,388x = 168,467,420.25
5. Step 5: Solve for x
   x = 168,467,420.25/8,388
6. Step 6: Final answer
   x = 20,084.34