Finding the Fourth Proportional to 5,739.05, 7,919.98 and 5,540.40

Step by Step Solution

1. Step 1: Write the proportion equation
   5,739.05 : 7,919.98 = 5,540.40 : x
2. Step 2: Convert to fraction form
   5,739.05/7,919.98 = 5,540.40/x
3. Step 3: Cross multiply
   5,739.05x = 7,919.98 × 5,540.40
4. Step 4: Simplify right side
   5,739.05x = 43,879,843.34
5. Step 5: Solve for x
   x = 43,879,843.34/5,739.05
6. Step 6: Final answer
   x = 7,645.83