Finding the Fourth Proportional to 2,280.78, 3,147.30 and 1,286.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.78 : 3,147.30 = 1,286.10 : x
2. Step 2: Convert to fraction form
   2,280.78/3,147.30 = 1,286.10/x
3. Step 3: Cross multiply
   2,280.78x = 3,147.30 × 1,286.10
4. Step 4: Simplify right side
   2,280.78x = 4,047,742.53
5. Step 5: Solve for x
   x = 4,047,742.53/2,280.78
6. Step 6: Final answer
   x = 1,774.72