Finding the Fourth Proportional to 3,911.01, 5,395.59 and 2,861.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,911.01 : 5,395.59 = 2,861.25 : x
2. Step 2: Convert to fraction form
   3,911.01/5,395.59 = 2,861.25/x
3. Step 3: Cross multiply
   3,911.01x = 5,395.59 × 2,861.25
4. Step 4: Simplify right side
   3,911.01x = 15,438,131.89
5. Step 5: Solve for x
   x = 15,438,131.89/3,911.01
6. Step 6: Final answer
   x = 3,947.35