Finding the Third Proportional to 12,999 and 28,158

Step by Step Solution

1. Step 1: Write the proportion equation
   12,999 : 28,158 = 28,158 : x
2. Step 2: Convert to fraction form
   12,999/28,158 = 28,158/x
3. Step 3: Cross multiply
   12,999x = 28,158 × 28,158
4. Step 4: Simplify right side
   12,999x = 792,872,964
5. Step 5: Solve for x
   x = 792,872,964/12,999
6. Step 6: Final answer
   x = 60,994.92