Finding the Fourth Proportional to 3,783.92, 5,221.71 and 2,105.33

Step by Step Solution

1. Step 1: Write the proportion equation
   3,783.92 : 5,221.71 = 2,105.33 : x
2. Step 2: Convert to fraction form
   3,783.92/5,221.71 = 2,105.33/x
3. Step 3: Cross multiply
   3,783.92x = 5,221.71 × 2,105.33
4. Step 4: Simplify right side
   3,783.92x = 10,993,396.61
5. Step 5: Solve for x
   x = 10,993,396.61/3,783.92
6. Step 6: Final answer
   x = 2,905.30