Finding the Fourth Proportional to 11,786.37, 17,691.17 and 8,657.59

Step by Step Solution

1. Step 1: Write the proportion equation
   11,786.37 : 17,691.17 = 8,657.59 : x
2. Step 2: Convert to fraction form
   11,786.37/17,691.17 = 8,657.59/x
3. Step 3: Cross multiply
   11,786.37x = 17,691.17 × 8,657.59
4. Step 4: Simplify right side
   11,786.37x = 153,162,896.48
5. Step 5: Solve for x
   x = 153,162,896.48/11,786.37
6. Step 6: Final answer
   x = 12,994.92