Finding the Fourth Proportional to 3,998.78, 5,518.56 and 2,320.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998.78 : 5,518.56 = 2,320.56 : x
2. Step 2: Convert to fraction form
   3,998.78/5,518.56 = 2,320.56/x
3. Step 3: Cross multiply
   3,998.78x = 5,518.56 × 2,320.56
4. Step 4: Simplify right side
   3,998.78x = 12,806,158.30
5. Step 5: Solve for x
   x = 12,806,158.30/3,998.78
6. Step 6: Final answer
   x = 3,202.52