Finding the Fourth Proportional to 3,919.11, 5,408.47 and 2,150.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,919.11 : 5,408.47 = 2,150.72 : x
2. Step 2: Convert to fraction form
   3,919.11/5,408.47 = 2,150.72/x
3. Step 3: Cross multiply
   3,919.11x = 5,408.47 × 2,150.72
4. Step 4: Simplify right side
   3,919.11x = 11,632,100.53
5. Step 5: Solve for x
   x = 11,632,100.53/3,919.11
6. Step 6: Final answer
   x = 2,968.04