Finding the Fourth Proportional to 2,391.30, 3,585.42 and 830.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.30 : 3,585.42 = 830.52 : x
2. Step 2: Convert to fraction form
   2,391.30/3,585.42 = 830.52/x
3. Step 3: Cross multiply
   2,391.30x = 3,585.42 × 830.52
4. Step 4: Simplify right side
   2,391.30x = 2,977,763.02
5. Step 5: Solve for x
   x = 2,977,763.02/2,391.30
6. Step 6: Final answer
   x = 1,245.25