Finding the Fourth Proportional to 3,783.74, 5,221.49 and 2,105.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,783.74 : 5,221.49 = 2,105.12 : x
2. Step 2: Convert to fraction form
   3,783.74/5,221.49 = 2,105.12/x
3. Step 3: Cross multiply
   3,783.74x = 5,221.49 × 2,105.12
4. Step 4: Simplify right side
   3,783.74x = 10,991,826.40
5. Step 5: Solve for x
   x = 10,991,826.40/3,783.74
6. Step 6: Final answer
   x = 2,905.01