Finding the Fourth Proportional to 1,636.27, 2,257.99 and 928.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.27 : 2,257.99 = 928.15 : x
2. Step 2: Convert to fraction form
   1,636.27/2,257.99 = 928.15/x
3. Step 3: Cross multiply
   1,636.27x = 2,257.99 × 928.15
4. Step 4: Simplify right side
   1,636.27x = 2,095,745.45
5. Step 5: Solve for x
   x = 2,095,745.45/1,636.27
6. Step 6: Final answer
   x = 1,280.81