Finding the Fourth Proportional to 3,784.15, 5,222.11 and 2,105.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,784.15 : 5,222.11 = 2,105.72 : x
2. Step 2: Convert to fraction form
   3,784.15/5,222.11 = 2,105.72/x
3. Step 3: Cross multiply
   3,784.15x = 5,222.11 × 2,105.72
4. Step 4: Simplify right side
   3,784.15x = 10,996,301.47
5. Step 5: Solve for x
   x = 10,996,301.47/3,784.15
6. Step 6: Final answer
   x = 2,905.88