Finding the Fourth Proportional to 2,328.05, 3,212.61 and 1,280.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,328.05 : 3,212.61 = 1,280.11 : x
2. Step 2: Convert to fraction form
   2,328.05/3,212.61 = 1,280.11/x
3. Step 3: Cross multiply
   2,328.05x = 3,212.61 × 1,280.11
4. Step 4: Simplify right side
   2,328.05x = 4,112,494.19
5. Step 5: Solve for x
   x = 4,112,494.19/2,328.05
6. Step 6: Final answer
   x = 1,766.50