Finding the Fourth Proportional to 12,727.88, 17,581.60 and 9,780.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,727.88 : 17,581.60 = 9,780.56 : x
2. Step 2: Convert to fraction form
   12,727.88/17,581.60 = 9,780.56/x
3. Step 3: Cross multiply
   12,727.88x = 17,581.60 × 9,780.56
4. Step 4: Simplify right side
   12,727.88x = 171,957,901.79
5. Step 5: Solve for x
   x = 171,957,901.79/12,727.88
6. Step 6: Final answer
   x = 13,510.33