Finding the Fourth Proportional to 5,410.96, 8,120.34 and 3,561.40

Step by Step Solution

1. Step 1: Write the proportion equation
   5,410.96 : 8,120.34 = 3,561.40 : x
2. Step 2: Convert to fraction form
   5,410.96/8,120.34 = 3,561.40/x
3. Step 3: Cross multiply
   5,410.96x = 8,120.34 × 3,561.40
4. Step 4: Simplify right side
   5,410.96x = 28,919,778.88
5. Step 5: Solve for x
   x = 28,919,778.88/5,410.96
6. Step 6: Final answer
   x = 5,344.67