Finding the Fourth Proportional to 3,978.24, 5,489.55 and 2,299.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.24 : 5,489.55 = 2,299.38 : x
2. Step 2: Convert to fraction form
   3,978.24/5,489.55 = 2,299.38/x
3. Step 3: Cross multiply
   3,978.24x = 5,489.55 × 2,299.38
4. Step 4: Simplify right side
   3,978.24x = 12,622,561.48
5. Step 5: Solve for x
   x = 12,622,561.48/3,978.24
6. Step 6: Final answer
   x = 3,172.90