Finding the Fourth Proportional to 9,919.28, 13,689.88 and 5,727.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,919.28 : 13,689.88 = 5,727.54 : x
2. Step 2: Convert to fraction form
   9,919.28/13,689.88 = 5,727.54/x
3. Step 3: Cross multiply
   9,919.28x = 13,689.88 × 5,727.54
4. Step 4: Simplify right side
   9,919.28x = 78,409,335.30
5. Step 5: Solve for x
   x = 78,409,335.30/9,919.28
6. Step 6: Final answer
   x = 7,904.74