Finding the Fourth Proportional to 2,787.98, 4,182.61 and 939.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,787.98 : 4,182.61 = 939.05 : x
2. Step 2: Convert to fraction form
   2,787.98/4,182.61 = 939.05/x
3. Step 3: Cross multiply
   2,787.98x = 4,182.61 × 939.05
4. Step 4: Simplify right side
   2,787.98x = 3,927,679.92
5. Step 5: Solve for x
   x = 3,927,679.92/2,787.98
6. Step 6: Final answer
   x = 1,408.79