Finding the Fourth Proportional to 9,909.12, 13,673.04 and 5,716.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,909.12 : 13,673.04 = 5,716.56 : x
2. Step 2: Convert to fraction form
   9,909.12/13,673.04 = 5,716.56/x
3. Step 3: Cross multiply
   9,909.12x = 13,673.04 × 5,716.56
4. Step 4: Simplify right side
   9,909.12x = 78,162,753.54
5. Step 5: Solve for x
   x = 78,162,753.54/9,909.12
6. Step 6: Final answer
   x = 7,887.96