Finding the Fourth Proportional to 1,144.72, 1,716.62 and 413.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.72 : 1,716.62 = 413.89 : x
2. Step 2: Convert to fraction form
   1,144.72/1,716.62 = 413.89/x
3. Step 3: Cross multiply
   1,144.72x = 1,716.62 × 413.89
4. Step 4: Simplify right side
   1,144.72x = 710,489.78
5. Step 5: Solve for x
   x = 710,489.78/1,144.72
6. Step 6: Final answer
   x = 620.67