Finding the Fourth Proportional to 2,328.16, 3,212.88 and 1,280.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,328.16 : 3,212.88 = 1,280.32 : x
2. Step 2: Convert to fraction form
   2,328.16/3,212.88 = 1,280.32/x
3. Step 3: Cross multiply
   2,328.16x = 3,212.88 × 1,280.32
4. Step 4: Simplify right side
   2,328.16x = 4,113,514.52
5. Step 5: Solve for x
   x = 4,113,514.52/2,328.16
6. Step 6: Final answer
   x = 1,766.85