Finding the Fourth Proportional to 3,879.42, 5,775.25 and 3,856.35

Step by Step Solution

1. Step 1: Write the proportion equation
   3,879.42 : 5,775.25 = 3,856.35 : x
2. Step 2: Convert to fraction form
   3,879.42/5,775.25 = 3,856.35/x
3. Step 3: Cross multiply
   3,879.42x = 5,775.25 × 3,856.35
4. Step 4: Simplify right side
   3,879.42x = 22,271,385.34
5. Step 5: Solve for x
   x = 22,271,385.34/3,879.42
6. Step 6: Final answer
   x = 5,740.91