Finding the Fourth Proportional to 3,860.86, 5,786.16 and 2,105.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,860.86 : 5,786.16 = 2,105.86 : x
2. Step 2: Convert to fraction form
   3,860.86/5,786.16 = 2,105.86/x
3. Step 3: Cross multiply
   3,860.86x = 5,786.16 × 2,105.86
4. Step 4: Simplify right side
   3,860.86x = 12,184,842.90
5. Step 5: Solve for x
   x = 12,184,842.90/3,860.86
6. Step 6: Final answer
   x = 3,155.99