Finding the Fourth Proportional to 3,834.31, 5,290.98 and 2,155.33

Step by Step Solution

1. Step 1: Write the proportion equation
   3,834.31 : 5,290.98 = 2,155.33 : x
2. Step 2: Convert to fraction form
   3,834.31/5,290.98 = 2,155.33/x
3. Step 3: Cross multiply
   3,834.31x = 5,290.98 × 2,155.33
4. Step 4: Simplify right side
   3,834.31x = 11,403,807.92
5. Step 5: Solve for x
   x = 11,403,807.92/3,834.31
6. Step 6: Final answer
   x = 2,974.15