Finding the Fourth Proportional to 13,771.60, 20,655.16 and 3,908.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,771.60 : 20,655.16 = 3,908.42 : x
2. Step 2: Convert to fraction form
   13,771.60/20,655.16 = 3,908.42/x
3. Step 3: Cross multiply
   13,771.60x = 20,655.16 × 3,908.42
4. Step 4: Simplify right side
   13,771.60x = 80,729,040.45
5. Step 5: Solve for x
   x = 80,729,040.45/13,771.60
6. Step 6: Final answer
   x = 5,861.99