Finding the Fourth Proportional to 5,709.74, 7,884.83 and 5,399.11

Step by Step Solution

1. Step 1: Write the proportion equation
   5,709.74 : 7,884.83 = 5,399.11 : x
2. Step 2: Convert to fraction form
   5,709.74/7,884.83 = 5,399.11/x
3. Step 3: Cross multiply
   5,709.74x = 7,884.83 × 5,399.11
4. Step 4: Simplify right side
   5,709.74x = 42,571,064.50
5. Step 5: Solve for x
   x = 42,571,064.50/5,709.74
6. Step 6: Final answer
   x = 7,455.87