Finding the Fourth Proportional to 2,570.47, 3,856.23 and 815.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.47 : 3,856.23 = 815.93 : x
2. Step 2: Convert to fraction form
   2,570.47/3,856.23 = 815.93/x
3. Step 3: Cross multiply
   2,570.47x = 3,856.23 × 815.93
4. Step 4: Simplify right side
   2,570.47x = 3,146,413.74
5. Step 5: Solve for x
   x = 3,146,413.74/2,570.47
6. Step 6: Final answer
   x = 1,224.06