Finding the Fourth Proportional to 3,998.36, 5,513.55 and 3,440.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998.36 : 5,513.55 = 3,440.72 : x
2. Step 2: Convert to fraction form
   3,998.36/5,513.55 = 3,440.72/x
3. Step 3: Cross multiply
   3,998.36x = 5,513.55 × 3,440.72
4. Step 4: Simplify right side
   3,998.36x = 18,970,581.76
5. Step 5: Solve for x
   x = 18,970,581.76/3,998.36
6. Step 6: Final answer
   x = 4,744.59