Finding the Fourth Proportional to 2,582.89, 3,875.15 and 939

Step by Step Solution

1. Step 1: Write the proportion equation
   2,582.89 : 3,875.15 = 939 : x
2. Step 2: Convert to fraction form
   2,582.89/3,875.15 = 939/x
3. Step 3: Cross multiply
   2,582.89x = 3,875.15 × 939
4. Step 4: Simplify right side
   2,582.89x = 3,638,765.85
5. Step 5: Solve for x
   x = 3,638,765.85/2,582.89
6. Step 6: Final answer
   x = 1,408.80