Finding the Fourth Proportional to 11,786.37, 17,668.62 and 3,989.73

Step by Step Solution

1. Step 1: Write the proportion equation
   11,786.37 : 17,668.62 = 3,989.73 : x
2. Step 2: Convert to fraction form
   11,786.37/17,668.62 = 3,989.73/x
3. Step 3: Cross multiply
   11,786.37x = 17,668.62 × 3,989.73
4. Step 4: Simplify right side
   11,786.37x = 70,493,023.27
5. Step 5: Solve for x
   x = 70,493,023.27/11,786.37
6. Step 6: Final answer
   x = 5,980.89