Finding the Third Proportional to 8,739 and 12,112.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,739 : 12,112.50 = 12,112.50 : x
2. Step 2: Convert to fraction form
   8,739/12,112.50 = 12,112.50/x
3. Step 3: Cross multiply
   8,739x = 12,112.50 × 12,112.50
4. Step 4: Simplify right side
   8,739x = 146,712,656.25
5. Step 5: Solve for x
   x = 146,712,656.25/8,739
6. Step 6: Final answer
   x = 16,788.27