Finding the Fourth Proportional to 5,716.72, 7,889.72 and 3,199.47

Step by Step Solution

1. Step 1: Write the proportion equation
   5,716.72 : 7,889.72 = 3,199.47 : x
2. Step 2: Convert to fraction form
   5,716.72/7,889.72 = 3,199.47/x
3. Step 3: Cross multiply
   5,716.72x = 7,889.72 × 3,199.47
4. Step 4: Simplify right side
   5,716.72x = 25,242,922.45
5. Step 5: Solve for x
   x = 25,242,922.45/5,716.72
6. Step 6: Final answer
   x = 4,415.63