Finding the Fourth Proportional to 2,280.61, 3,147.20 and 1,285.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.61 : 3,147.20 = 1,285.87 : x
2. Step 2: Convert to fraction form
   2,280.61/3,147.20 = 1,285.87/x
3. Step 3: Cross multiply
   2,280.61x = 3,147.20 × 1,285.87
4. Step 4: Simplify right side
   2,280.61x = 4,046,890.06
5. Step 5: Solve for x
   x = 4,046,890.06/2,280.61
6. Step 6: Final answer
   x = 1,774.48