Finding the Fourth Proportional to 2,389.10, 3,580.00 and 1,089.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.10 : 3,580.00 = 1,089.05 : x
2. Step 2: Convert to fraction form
   2,389.10/3,580.00 = 1,089.05/x
3. Step 3: Cross multiply
   2,389.10x = 3,580.00 × 1,089.05
4. Step 4: Simplify right side
   2,389.10x = 3,898,778.38
5. Step 5: Solve for x
   x = 3,898,778.38/2,389.10
6. Step 6: Final answer
   x = 1,631.91