Finding the Fourth Proportional to 3,859.49, 5,776.60 and 2,100.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,859.49 : 5,776.60 = 2,100.10 : x
2. Step 2: Convert to fraction form
   3,859.49/5,776.60 = 2,100.10/x
3. Step 3: Cross multiply
   3,859.49x = 5,776.60 × 2,100.10
4. Step 4: Simplify right side
   3,859.49x = 12,131,408.78
5. Step 5: Solve for x
   x = 12,131,408.78/3,859.49
6. Step 6: Final answer
   x = 3,143.27