Finding the Fourth Proportional to 2,280.18, 3,146.59 and 1,285.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.18 : 3,146.59 = 1,285.40 : x
2. Step 2: Convert to fraction form
   2,280.18/3,146.59 = 1,285.40/x
3. Step 3: Cross multiply
   2,280.18x = 3,146.59 × 1,285.40
4. Step 4: Simplify right side
   2,280.18x = 4,044,636.26
5. Step 5: Solve for x
   x = 4,044,636.26/2,280.18
6. Step 6: Final answer
   x = 1,773.82