Finding the Fourth Proportional to 3,960.30, 5,464.98 and 2,191.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,960.30 : 5,464.98 = 2,191.80 : x
2. Step 2: Convert to fraction form
   3,960.30/5,464.98 = 2,191.80/x
3. Step 3: Cross multiply
   3,960.30x = 5,464.98 × 2,191.80
4. Step 4: Simplify right side
   3,960.30x = 11,978,143.16
5. Step 5: Solve for x
   x = 11,978,143.16/3,960.30
6. Step 6: Final answer
   x = 3,024.55