Finding the Fourth Proportional to 12,680.05, 18,947.55 and 9,661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,680.05 : 18,947.55 = 9,661.50 : x
2. Step 2: Convert to fraction form
   12,680.05/18,947.55 = 9,661.50/x
3. Step 3: Cross multiply
   12,680.05x = 18,947.55 × 9,661.50
4. Step 4: Simplify right side
   12,680.05x = 183,061,754.33
5. Step 5: Solve for x
   x = 183,061,754.33/12,680.05
6. Step 6: Final answer
   x = 14,436.99