Finding the Fourth Proportional to 2,328.05, 3,212.80 and 1,280.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,328.05 : 3,212.80 = 1,280.12 : x
2. Step 2: Convert to fraction form
   2,328.05/3,212.80 = 1,280.12/x
3. Step 3: Cross multiply
   2,328.05x = 3,212.80 × 1,280.12
4. Step 4: Simplify right side
   2,328.05x = 4,112,750.27
5. Step 5: Solve for x
   x = 4,112,750.27/2,328.05
6. Step 6: Final answer
   x = 1,766.61