Finding the Fourth Proportional to 11,385.37, 17,080.49 and 3,990.27

Step by Step Solution

1. Step 1: Write the proportion equation
   11,385.37 : 17,080.49 = 3,990.27 : x
2. Step 2: Convert to fraction form
   11,385.37/17,080.49 = 3,990.27/x
3. Step 3: Cross multiply
   11,385.37x = 17,080.49 × 3,990.27
4. Step 4: Simplify right side
   11,385.37x = 68,155,766.83
5. Step 5: Solve for x
   x = 68,155,766.83/11,385.37
6. Step 6: Final answer
   x = 5,986.26