Finding the Fourth Proportional to 3,849.94, 5,778.99 and 3,128.23

Step by Step Solution

1. Step 1: Write the proportion equation
   3,849.94 : 5,778.99 = 3,128.23 : x
2. Step 2: Convert to fraction form
   3,849.94/5,778.99 = 3,128.23/x
3. Step 3: Cross multiply
   3,849.94x = 5,778.99 × 3,128.23
4. Step 4: Simplify right side
   3,849.94x = 18,078,009.89
5. Step 5: Solve for x
   x = 18,078,009.89/3,849.94
6. Step 6: Final answer
   x = 4,695.66