Finding the Fourth Proportional to 2,289.13, 3,158.82 and 1,280.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,289.13 : 3,158.82 = 1,280.83 : x
2. Step 2: Convert to fraction form
   2,289.13/3,158.82 = 1,280.83/x
3. Step 3: Cross multiply
   2,289.13x = 3,158.82 × 1,280.83
4. Step 4: Simplify right side
   2,289.13x = 4,045,911.42
5. Step 5: Solve for x
   x = 4,045,911.42/2,289.13
6. Step 6: Final answer
   x = 1,767.45