Finding the Fourth Proportional to 2,788.58, 4,182.72 and 939.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,788.58 : 4,182.72 = 939.71 : x
2. Step 2: Convert to fraction form
   2,788.58/4,182.72 = 939.71/x
3. Step 3: Cross multiply
   2,788.58x = 4,182.72 × 939.71
4. Step 4: Simplify right side
   2,788.58x = 3,930,522.90
5. Step 5: Solve for x
   x = 3,930,522.90/2,788.58
6. Step 6: Final answer
   x = 1,409.51