Finding the Fourth Proportional to 2,280.12, 3,146.58 and 1,285.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.12 : 3,146.58 = 1,285.30 : x
2. Step 2: Convert to fraction form
   2,280.12/3,146.58 = 1,285.30/x
3. Step 3: Cross multiply
   2,280.12x = 3,146.58 × 1,285.30
4. Step 4: Simplify right side
   2,280.12x = 4,044,299.27
5. Step 5: Solve for x
   x = 4,044,299.27/2,280.12
6. Step 6: Final answer
   x = 1,773.72