Finding the Fourth Proportional to 11,857.55, 17,786.61 and 5,616.09

Step by Step Solution

1. Step 1: Write the proportion equation
   11,857.55 : 17,786.61 = 5,616.09 : x
2. Step 2: Convert to fraction form
   11,857.55/17,786.61 = 5,616.09/x
3. Step 3: Cross multiply
   11,857.55x = 17,786.61 × 5,616.09
4. Step 4: Simplify right side
   11,857.55x = 99,891,202.55
5. Step 5: Solve for x
   x = 99,891,202.55/11,857.55
6. Step 6: Final answer
   x = 8,424.27