Finding the Fourth Proportional to 3,906.01, 5,388.69 and 2,856.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,906.01 : 5,388.69 = 2,856.25 : x
2. Step 2: Convert to fraction form
   3,906.01/5,388.69 = 2,856.25/x
3. Step 3: Cross multiply
   3,906.01x = 5,388.69 × 2,856.25
4. Step 4: Simplify right side
   3,906.01x = 15,391,445.81
5. Step 5: Solve for x
   x = 15,391,445.81/3,906.01
6. Step 6: Final answer
   x = 3,940.45