Finding the Fourth Proportional to 2,389.78, 3,581.43 and 1,088.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.78 : 3,581.43 = 1,088.38 : x
2. Step 2: Convert to fraction form
   2,389.78/3,581.43 = 1,088.38/x
3. Step 3: Cross multiply
   2,389.78x = 3,581.43 × 1,088.38
4. Step 4: Simplify right side
   2,389.78x = 3,897,956.78
5. Step 5: Solve for x
   x = 3,897,956.78/2,389.78
6. Step 6: Final answer
   x = 1,631.09