Finding the Fourth Proportional to 11,719.20, 17,577.72 and 3,928.08

Step by Step Solution

1. Step 1: Write the proportion equation
   11,719.20 : 17,577.72 = 3,928.08 : x
2. Step 2: Convert to fraction form
   11,719.20/17,577.72 = 3,928.08/x
3. Step 3: Cross multiply
   11,719.20x = 17,577.72 × 3,928.08
4. Step 4: Simplify right side
   11,719.20x = 69,046,690.38
5. Step 5: Solve for x
   x = 69,046,690.38/11,719.20
6. Step 6: Final answer
   x = 5,891.76