Finding the Fourth Proportional to 3,783.93, 5,221.67 and 2,105.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,783.93 : 5,221.67 = 2,105.28 : x
2. Step 2: Convert to fraction form
   3,783.93/5,221.67 = 2,105.28/x
3. Step 3: Cross multiply
   3,783.93x = 5,221.67 × 2,105.28
4. Step 4: Simplify right side
   3,783.93x = 10,993,077.42
5. Step 5: Solve for x
   x = 10,993,077.42/3,783.93
6. Step 6: Final answer
   x = 2,905.20