Finding the Fourth Proportional to 1,025.17, 1,413.25 and 815.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,025.17 : 1,413.25 = 815.43 : x
2. Step 2: Convert to fraction form
   1,025.17/1,413.25 = 815.43/x
3. Step 3: Cross multiply
   1,025.17x = 1,413.25 × 815.43
4. Step 4: Simplify right side
   1,025.17x = 1,152,404.41
5. Step 5: Solve for x
   x = 1,152,404.41/1,025.17
6. Step 6: Final answer
   x = 1,124.11