Finding the Fourth Proportional to 2,420.09, 3,631.76 and 860.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,420.09 : 3,631.76 = 860.03 : x
2. Step 2: Convert to fraction form
   2,420.09/3,631.76 = 860.03/x
3. Step 3: Cross multiply
   2,420.09x = 3,631.76 × 860.03
4. Step 4: Simplify right side
   2,420.09x = 3,123,418.25
5. Step 5: Solve for x
   x = 3,123,418.25/2,420.09
6. Step 6: Final answer
   x = 1,290.62