Finding the Third Proportional to 8,356 and 12,904

Step by Step Solution

1. Step 1: Write the proportion equation
   8,356 : 12,904 = 12,904 : x
2. Step 2: Convert to fraction form
   8,356/12,904 = 12,904/x
3. Step 3: Cross multiply
   8,356x = 12,904 × 12,904
4. Step 4: Simplify right side
   8,356x = 166,513,216
5. Step 5: Solve for x
   x = 166,513,216/8,356
6. Step 6: Final answer
   x = 19,927.38