Finding the Fourth Proportional to 1,144.47, 1,716.72 and 413.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.47 : 1,716.72 = 413.55 : x
2. Step 2: Convert to fraction form
   1,144.47/1,716.72 = 413.55/x
3. Step 3: Cross multiply
   1,144.47x = 1,716.72 × 413.55
4. Step 4: Simplify right side
   1,144.47x = 709,949.56
5. Step 5: Solve for x
   x = 709,949.56/1,144.47
6. Step 6: Final answer
   x = 620.33