Finding the Fourth Proportional to 12,786.66, 17,645.04 and 9,243.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,786.66 : 17,645.04 = 9,243.72 : x
2. Step 2: Convert to fraction form
   12,786.66/17,645.04 = 9,243.72/x
3. Step 3: Cross multiply
   12,786.66x = 17,645.04 × 9,243.72
4. Step 4: Simplify right side
   12,786.66x = 163,105,809.15
5. Step 5: Solve for x
   x = 163,105,809.15/12,786.66
6. Step 6: Final answer
   x = 12,755.94