Finding the Fourth Proportional to 9,919.69, 13,689.18 and 5,727.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,919.69 : 13,689.18 = 5,727.94 : x
2. Step 2: Convert to fraction form
   9,919.69/13,689.18 = 5,727.94/x
3. Step 3: Cross multiply
   9,919.69x = 13,689.18 × 5,727.94
4. Step 4: Simplify right side
   9,919.69x = 78,410,801.69
5. Step 5: Solve for x
   x = 78,410,801.69/9,919.69
6. Step 6: Final answer
   x = 7,904.56