Finding the Fourth Proportional to 2,280.48, 3,146.72 and 1,285.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.48 : 3,146.72 = 1,285.70 : x
2. Step 2: Convert to fraction form
   2,280.48/3,146.72 = 1,285.70/x
3. Step 3: Cross multiply
   2,280.48x = 3,146.72 × 1,285.70
4. Step 4: Simplify right side
   2,280.48x = 4,045,737.90
5. Step 5: Solve for x
   x = 4,045,737.90/2,280.48
6. Step 6: Final answer
   x = 1,774.07