Finding the Fourth Proportional to 11,380.28, 17,078.09 and 3,984.80

Step by Step Solution

1. Step 1: Write the proportion equation
   11,380.28 : 17,078.09 = 3,984.80 : x
2. Step 2: Convert to fraction form
   11,380.28/17,078.09 = 3,984.80/x
3. Step 3: Cross multiply
   11,380.28x = 17,078.09 × 3,984.80
4. Step 4: Simplify right side
   11,380.28x = 68,052,667.72
5. Step 5: Solve for x
   x = 68,052,667.72/11,380.28
6. Step 6: Final answer
   x = 5,979.88