Finding the Fourth Proportional to 3,589.82, 5,381.46 and 1,280.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,589.82 : 5,381.46 = 1,280.78 : x
2. Step 2: Convert to fraction form
   3,589.82/5,381.46 = 1,280.78/x
3. Step 3: Cross multiply
   3,589.82x = 5,381.46 × 1,280.78
4. Step 4: Simplify right side
   3,589.82x = 6,892,439.43
5. Step 5: Solve for x
   x = 6,892,439.43/3,589.82
6. Step 6: Final answer
   x = 1,920.00