Finding the Fourth Proportional to 1,608.95, 2,413.69 and 621.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,608.95 : 2,413.69 = 621.72 : x
2. Step 2: Convert to fraction form
   1,608.95/2,413.69 = 621.72/x
3. Step 3: Cross multiply
   1,608.95x = 2,413.69 × 621.72
4. Step 4: Simplify right side
   1,608.95x = 1,500,637.79
5. Step 5: Solve for x
   x = 1,500,637.79/1,608.95
6. Step 6: Final answer
   x = 932.68