Finding the Fourth Proportional to 2,581.56, 3,870.41 and 939.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,581.56 : 3,870.41 = 939.48 : x
2. Step 2: Convert to fraction form
   2,581.56/3,870.41 = 939.48/x
3. Step 3: Cross multiply
   2,581.56x = 3,870.41 × 939.48
4. Step 4: Simplify right side
   2,581.56x = 3,636,168.09
5. Step 5: Solve for x
   x = 3,636,168.09/2,581.56
6. Step 6: Final answer
   x = 1,408.52