Finding the Fourth Proportional to 2,280.67, 3,147.24 and 1,285.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.67 : 3,147.24 = 1,285.90 : x
2. Step 2: Convert to fraction form
   2,280.67/3,147.24 = 1,285.90/x
3. Step 3: Cross multiply
   2,280.67x = 3,147.24 × 1,285.90
4. Step 4: Simplify right side
   2,280.67x = 4,047,035.92
5. Step 5: Solve for x
   x = 4,047,035.92/2,280.67
6. Step 6: Final answer
   x = 1,774.49