Finding the Fourth Proportional to 3,834.30, 5,291.82 and 2,155.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,834.30 : 5,291.82 = 2,155.80 : x
2. Step 2: Convert to fraction form
   3,834.30/5,291.82 = 2,155.80/x
3. Step 3: Cross multiply
   3,834.30x = 5,291.82 × 2,155.80
4. Step 4: Simplify right side
   3,834.30x = 11,408,105.56
5. Step 5: Solve for x
   x = 11,408,105.56/3,834.30
6. Step 6: Final answer
   x = 2,975.28