Finding the Fourth Proportional to 1,644.05, 2,460.47 and 1,280.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,644.05 : 2,460.47 = 1,280.49 : x
2. Step 2: Convert to fraction form
   1,644.05/2,460.47 = 1,280.49/x
3. Step 3: Cross multiply
   1,644.05x = 2,460.47 × 1,280.49
4. Step 4: Simplify right side
   1,644.05x = 3,150,600.83
5. Step 5: Solve for x
   x = 3,150,600.83/1,644.05
6. Step 6: Final answer
   x = 1,916.37