Finding the Fourth Proportional to 3,833.61, 5,290.35 and 2,155.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,833.61 : 5,290.35 = 2,155.05 : x
2. Step 2: Convert to fraction form
   3,833.61/5,290.35 = 2,155.05/x
3. Step 3: Cross multiply
   3,833.61x = 5,290.35 × 2,155.05
4. Step 4: Simplify right side
   3,833.61x = 11,400,968.77
5. Step 5: Solve for x
   x = 11,400,968.77/3,833.61
6. Step 6: Final answer
   x = 2,973.95