Finding the Fourth Proportional to 5,715.78, 7,887.83 and 3,198.03

Step by Step Solution

1. Step 1: Write the proportion equation
   5,715.78 : 7,887.83 = 3,198.03 : x
2. Step 2: Convert to fraction form
   5,715.78/7,887.83 = 3,198.03/x
3. Step 3: Cross multiply
   5,715.78x = 7,887.83 × 3,198.03
4. Step 4: Simplify right side
   5,715.78x = 25,225,500.98
5. Step 5: Solve for x
   x = 25,225,500.98/5,715.78
6. Step 6: Final answer
   x = 4,413.31