Finding the Third Proportional to 12,990 and 28,167

Step by Step Solution

1. Step 1: Write the proportion equation
   12,990 : 28,167 = 28,167 : x
2. Step 2: Convert to fraction form
   12,990/28,167 = 28,167/x
3. Step 3: Cross multiply
   12,990x = 28,167 × 28,167
4. Step 4: Simplify right side
   12,990x = 793,379,889
5. Step 5: Solve for x
   x = 793,379,889/12,990
6. Step 6: Final answer
   x = 61,076.20