Finding the Third Proportional to 12,879 and 28,216

Step by Step Solution

1. Step 1: Write the proportion equation
   12,879 : 28,216 = 28,216 : x
2. Step 2: Convert to fraction form
   12,879/28,216 = 28,216/x
3. Step 3: Cross multiply
   12,879x = 28,216 × 28,216
4. Step 4: Simplify right side
   12,879x = 796,142,656
5. Step 5: Solve for x
   x = 796,142,656/12,879
6. Step 6: Final answer
   x = 61,817.12