Finding the Fourth Proportional to 2,287.78, 3,432.17 and 728.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.78 : 3,432.17 = 728.26 : x
2. Step 2: Convert to fraction form
   2,287.78/3,432.17 = 728.26/x
3. Step 3: Cross multiply
   2,287.78x = 3,432.17 × 728.26
4. Step 4: Simplify right side
   2,287.78x = 2,499,491.32
5. Step 5: Solve for x
   x = 2,499,491.32/2,287.78
6. Step 6: Final answer
   x = 1,092.54