Finding the Third Proportional to 12,739 and 19,676.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,739 : 19,676.50 = 19,676.50 : x
2. Step 2: Convert to fraction form
   12,739/19,676.50 = 19,676.50/x
3. Step 3: Cross multiply
   12,739x = 19,676.50 × 19,676.50
4. Step 4: Simplify right side
   12,739x = 387,164,652.25
5. Step 5: Solve for x
   x = 387,164,652.25/12,739
6. Step 6: Final answer
   x = 30,392.08