Finding the Fourth Proportional to 2,421.12, 3,630.42 and 860.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,421.12 : 3,630.42 = 860.52 : x
2. Step 2: Convert to fraction form
   2,421.12/3,630.42 = 860.52/x
3. Step 3: Cross multiply
   2,421.12x = 3,630.42 × 860.52
4. Step 4: Simplify right side
   2,421.12x = 3,124,049.02
5. Step 5: Solve for x
   x = 3,124,049.02/2,421.12
6. Step 6: Final answer
   x = 1,290.33