Finding the Fourth Proportional to 2,328.72, 3,213.57 and 1,280.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,328.72 : 3,213.57 = 1,280.79 : x
2. Step 2: Convert to fraction form
   2,328.72/3,213.57 = 1,280.79/x
3. Step 3: Cross multiply
   2,328.72x = 3,213.57 × 1,280.79
4. Step 4: Simplify right side
   2,328.72x = 4,115,895.45
5. Step 5: Solve for x
   x = 4,115,895.45/2,328.72
6. Step 6: Final answer
   x = 1,767.45