Finding the Fourth Proportional to 2,413.09, 3,619.59 and 931.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,413.09 : 3,619.59 = 931.91 : x
2. Step 2: Convert to fraction form
   2,413.09/3,619.59 = 931.91/x
3. Step 3: Cross multiply
   2,413.09x = 3,619.59 × 931.91
4. Step 4: Simplify right side
   2,413.09x = 3,373,110.52
5. Step 5: Solve for x
   x = 3,373,110.52/2,413.09
6. Step 6: Final answer
   x = 1,397.84