Finding the Fourth Proportional to 9,185.27, 13,777.61 and 3,991.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,185.27 : 13,777.61 = 3,991.15 : x
2. Step 2: Convert to fraction form
   9,185.27/13,777.61 = 3,991.15/x
3. Step 3: Cross multiply
   9,185.27x = 13,777.61 × 3,991.15
4. Step 4: Simplify right side
   9,185.27x = 54,988,453.75
5. Step 5: Solve for x
   x = 54,988,453.75/9,185.27
6. Step 6: Final answer
   x = 5,986.59