Finding the Fourth Proportional to 5,401.89, 8,111.34 and 3,187.55

Step by Step Solution

1. Step 1: Write the proportion equation
   5,401.89 : 8,111.34 = 3,187.55 : x
2. Step 2: Convert to fraction form
   5,401.89/8,111.34 = 3,187.55/x
3. Step 3: Cross multiply
   5,401.89x = 8,111.34 × 3,187.55
4. Step 4: Simplify right side
   5,401.89x = 25,855,322.10
5. Step 5: Solve for x
   x = 25,855,322.10/5,401.89
6. Step 6: Final answer
   x = 4,786.35