Finding the Fourth Proportional to 2,391.61, 3,589.04 and 930.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.61 : 3,589.04 = 930.57 : x
2. Step 2: Convert to fraction form
   2,391.61/3,589.04 = 930.57/x
3. Step 3: Cross multiply
   2,391.61x = 3,589.04 × 930.57
4. Step 4: Simplify right side
   2,391.61x = 3,339,852.95
5. Step 5: Solve for x
   x = 3,339,852.95/2,391.61
6. Step 6: Final answer
   x = 1,396.49