Finding the Third Proportional to 12,139 and 16,478.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,139 : 16,478.50 = 16,478.50 : x
2. Step 2: Convert to fraction form
   12,139/16,478.50 = 16,478.50/x
3. Step 3: Cross multiply
   12,139x = 16,478.50 × 16,478.50
4. Step 4: Simplify right side
   12,139x = 271,540,962.25
5. Step 5: Solve for x
   x = 271,540,962.25/12,139
6. Step 6: Final answer
   x = 22,369.30