Finding the Fourth Proportional to 2,280.10, 3,146.70 and 1,285.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.10 : 3,146.70 = 1,285.47 : x
2. Step 2: Convert to fraction form
   2,280.10/3,146.70 = 1,285.47/x
3. Step 3: Cross multiply
   2,280.10x = 3,146.70 × 1,285.47
4. Step 4: Simplify right side
   2,280.10x = 4,044,986.04
5. Step 5: Solve for x
   x = 4,044,986.04/2,280.10
6. Step 6: Final answer
   x = 1,774.04