Finding the Fourth Proportional to 2,280.31, 3,146.88 and 1,285.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.31 : 3,146.88 = 1,285.56 : x
2. Step 2: Convert to fraction form
   2,280.31/3,146.88 = 1,285.56/x
3. Step 3: Cross multiply
   2,280.31x = 3,146.88 × 1,285.56
4. Step 4: Simplify right side
   2,280.31x = 4,045,503.05
5. Step 5: Solve for x
   x = 4,045,503.05/2,280.31
6. Step 6: Final answer
   x = 1,774.10