Finding the Fourth Proportional to 2,420.55, 3,631.10 and 860.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,420.55 : 3,631.10 = 860.22 : x
2. Step 2: Convert to fraction form
   2,420.55/3,631.10 = 860.22/x
3. Step 3: Cross multiply
   2,420.55x = 3,631.10 × 860.22
4. Step 4: Simplify right side
   2,420.55x = 3,123,540.54
5. Step 5: Solve for x
   x = 3,123,540.54/2,420.55
6. Step 6: Final answer
   x = 1,290.43