Finding the Fourth Proportional to 3,819.78, 5,264.15 and 2,979.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,819.78 : 5,264.15 = 2,979.15 : x
2. Step 2: Convert to fraction form
   3,819.78/5,264.15 = 2,979.15/x
3. Step 3: Cross multiply
   3,819.78x = 5,264.15 × 2,979.15
4. Step 4: Simplify right side
   3,819.78x = 15,682,692.47
5. Step 5: Solve for x
   x = 15,682,692.47/3,819.78
6. Step 6: Final answer
   x = 4,105.65