Finding the Fourth Proportional to 3,964.89, 5,945.52 and 2,115.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,964.89 : 5,945.52 = 2,115.57 : x
2. Step 2: Convert to fraction form
   3,964.89/5,945.52 = 2,115.57/x
3. Step 3: Cross multiply
   3,964.89x = 5,945.52 × 2,115.57
4. Step 4: Simplify right side
   3,964.89x = 12,578,163.75
5. Step 5: Solve for x
   x = 12,578,163.75/3,964.89
6. Step 6: Final answer
   x = 3,172.39