Finding the Fourth Proportional to 3,680.56, 5,531.76 and 3,408.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,680.56 : 5,531.76 = 3,408.96 : x
2. Step 2: Convert to fraction form
   3,680.56/5,531.76 = 3,408.96/x
3. Step 3: Cross multiply
   3,680.56x = 5,531.76 × 3,408.96
4. Step 4: Simplify right side
   3,680.56x = 18,857,548.57
5. Step 5: Solve for x
   x = 18,857,548.57/3,680.56
6. Step 6: Final answer
   x = 5,123.55