Finding the Fourth Proportional to 2,399.86, 3,590.87 and 2,105.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.86 : 3,590.87 = 2,105.98 : x
2. Step 2: Convert to fraction form
   2,399.86/3,590.87 = 2,105.98/x
3. Step 3: Cross multiply
   2,399.86x = 3,590.87 × 2,105.98
4. Step 4: Simplify right side
   2,399.86x = 7,562,271.92
5. Step 5: Solve for x
   x = 7,562,271.92/2,399.86
6. Step 6: Final answer
   x = 3,151.14