Finding the Fourth Proportional to 2,188.34, 3,280.41 and 726.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.34 : 3,280.41 = 726.69 : x
2. Step 2: Convert to fraction form
   2,188.34/3,280.41 = 726.69/x
3. Step 3: Cross multiply
   2,188.34x = 3,280.41 × 726.69
4. Step 4: Simplify right side
   2,188.34x = 2,383,841.14
5. Step 5: Solve for x
   x = 2,383,841.14/2,188.34
6. Step 6: Final answer
   x = 1,089.34