Finding the Fourth Proportional to 2,275.72, 3,413.78 and 976.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.72 : 3,413.78 = 976.88 : x
2. Step 2: Convert to fraction form
   2,275.72/3,413.78 = 976.88/x
3. Step 3: Cross multiply
   2,275.72x = 3,413.78 × 976.88
4. Step 4: Simplify right side
   2,275.72x = 3,334,853.41
5. Step 5: Solve for x
   x = 3,334,853.41/2,275.72
6. Step 6: Final answer
   x = 1,465.41