Finding the Fourth Proportional to 2,517.57, 3,776.34 and 978.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,517.57 : 3,776.34 = 978.57 : x
2. Step 2: Convert to fraction form
   2,517.57/3,776.34 = 978.57/x
3. Step 3: Cross multiply
   2,517.57x = 3,776.34 × 978.57
4. Step 4: Simplify right side
   2,517.57x = 3,695,413.03
5. Step 5: Solve for x
   x = 3,695,413.03/2,517.57
6. Step 6: Final answer
   x = 1,467.85