Finding the Fourth Proportional to 2,421.50, 3,630.02 and 860.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,421.50 : 3,630.02 = 860.42 : x
2. Step 2: Convert to fraction form
   2,421.50/3,630.02 = 860.42/x
3. Step 3: Cross multiply
   2,421.50x = 3,630.02 × 860.42
4. Step 4: Simplify right side
   2,421.50x = 3,123,346.58
5. Step 5: Solve for x
   x = 3,123,346.58/2,421.50
6. Step 6: Final answer
   x = 1,289.84