Finding the Fourth Proportional to 3,647.81, 5,033.77 and 2,155.39

Step by Step Solution

1. Step 1: Write the proportion equation
   3,647.81 : 5,033.77 = 2,155.39 : x
2. Step 2: Convert to fraction form
   3,647.81/5,033.77 = 2,155.39/x
3. Step 3: Cross multiply
   3,647.81x = 5,033.77 × 2,155.39
4. Step 4: Simplify right side
   3,647.81x = 10,849,719.55
5. Step 5: Solve for x
   x = 10,849,719.55/3,647.81
6. Step 6: Final answer
   x = 2,974.31