Finding the Fourth Proportional to 8,956.86, 13,436.37 and 3,408.90

Step by Step Solution

1. Step 1: Write the proportion equation
   8,956.86 : 13,436.37 = 3,408.90 : x
2. Step 2: Convert to fraction form
   8,956.86/13,436.37 = 3,408.90/x
3. Step 3: Cross multiply
   8,956.86x = 13,436.37 × 3,408.90
4. Step 4: Simplify right side
   8,956.86x = 45,803,241.69
5. Step 5: Solve for x
   x = 45,803,241.69/8,956.86
6. Step 6: Final answer
   x = 5,113.76