Finding the Fourth Proportional to 10,275.98, 15,413.67 and 2,780.25

Step by Step Solution

1. Step 1: Write the proportion equation
   10,275.98 : 15,413.67 = 2,780.25 : x
2. Step 2: Convert to fraction form
   10,275.98/15,413.67 = 2,780.25/x
3. Step 3: Cross multiply
   10,275.98x = 15,413.67 × 2,780.25
4. Step 4: Simplify right side
   10,275.98x = 42,853,856.02
5. Step 5: Solve for x
   x = 42,853,856.02/10,275.98
6. Step 6: Final answer
   x = 4,170.30