Finding the Fourth Proportional to 3,834.16, 5,291.04 and 2,155.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,834.16 : 5,291.04 = 2,155.72 : x
2. Step 2: Convert to fraction form
   3,834.16/5,291.04 = 2,155.72/x
3. Step 3: Cross multiply
   3,834.16x = 5,291.04 × 2,155.72
4. Step 4: Simplify right side
   3,834.16x = 11,406,000.75
5. Step 5: Solve for x
   x = 11,406,000.75/3,834.16
6. Step 6: Final answer
   x = 2,974.84