Finding the Fourth Proportional to 3,806.83, 5,253.31 and 2,128.24

Step by Step Solution

1. Step 1: Write the proportion equation
   3,806.83 : 5,253.31 = 2,128.24 : x
2. Step 2: Convert to fraction form
   3,806.83/5,253.31 = 2,128.24/x
3. Step 3: Cross multiply
   3,806.83x = 5,253.31 × 2,128.24
4. Step 4: Simplify right side
   3,806.83x = 11,180,304.47
5. Step 5: Solve for x
   x = 11,180,304.47/3,806.83
6. Step 6: Final answer
   x = 2,936.91