Finding the Fourth Proportional to 1,083.05, 1,624.71 and 389.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,083.05 : 1,624.71 = 389.57 : x
2. Step 2: Convert to fraction form
   1,083.05/1,624.71 = 389.57/x
3. Step 3: Cross multiply
   1,083.05x = 1,624.71 × 389.57
4. Step 4: Simplify right side
   1,083.05x = 632,938.27
5. Step 5: Solve for x
   x = 632,938.27/1,083.05
6. Step 6: Final answer
   x = 584.41