Finding the Fourth Proportional to 3,806.89, 5,253.63 and 2,105.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,806.89 : 5,253.63 = 2,105.42 : x
2. Step 2: Convert to fraction form
   3,806.89/5,253.63 = 2,105.42/x
3. Step 3: Cross multiply
   3,806.89x = 5,253.63 × 2,105.42
4. Step 4: Simplify right side
   3,806.89x = 11,061,060.88
5. Step 5: Solve for x
   x = 11,061,060.88/3,806.89
6. Step 6: Final answer
   x = 2,905.54