Finding the Fourth Proportional to 2,389.98, 3,580.17 and 1,089.66

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.98 : 3,580.17 = 1,089.66 : x
2. Step 2: Convert to fraction form
   2,389.98/3,580.17 = 1,089.66/x
3. Step 3: Cross multiply
   2,389.98x = 3,580.17 × 1,089.66
4. Step 4: Simplify right side
   2,389.98x = 3,901,168.04
5. Step 5: Solve for x
   x = 3,901,168.04/2,389.98
6. Step 6: Final answer
   x = 1,632.30