Finding the Fourth Proportional to 1,413.73, 2,118.45 and 865.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,413.73 : 2,118.45 = 865.15 : x
2. Step 2: Convert to fraction form
   1,413.73/2,118.45 = 865.15/x
3. Step 3: Cross multiply
   1,413.73x = 2,118.45 × 865.15
4. Step 4: Simplify right side
   1,413.73x = 1,832,777.02
5. Step 5: Solve for x
   x = 1,832,777.02/1,413.73
6. Step 6: Final answer
   x = 1,296.41