Finding the Fourth Proportional to 3,783.81, 5,221.37 and 2,105.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,783.81 : 5,221.37 = 2,105.18 : x
2. Step 2: Convert to fraction form
   3,783.81/5,221.37 = 2,105.18/x
3. Step 3: Cross multiply
   3,783.81x = 5,221.37 × 2,105.18
4. Step 4: Simplify right side
   3,783.81x = 10,991,902.85
5. Step 5: Solve for x
   x = 10,991,902.85/3,783.81
6. Step 6: Final answer
   x = 2,904.98