Finding the Fourth Proportional to 2,280.42, 3,147.06 and 1,285.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.42 : 3,147.06 = 1,285.74 : x
2. Step 2: Convert to fraction form
   2,280.42/3,147.06 = 1,285.74/x
3. Step 3: Cross multiply
   2,280.42x = 3,147.06 × 1,285.74
4. Step 4: Simplify right side
   2,280.42x = 4,046,300.92
5. Step 5: Solve for x
   x = 4,046,300.92/2,280.42
6. Step 6: Final answer
   x = 1,774.37