Finding the Fourth Proportional to 2,763.72, 3,819.15 and 2,178.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,763.72 : 3,819.15 = 2,178.90 : x
2. Step 2: Convert to fraction form
   2,763.72/3,819.15 = 2,178.90/x
3. Step 3: Cross multiply
   2,763.72x = 3,819.15 × 2,178.90
4. Step 4: Simplify right side
   2,763.72x = 8,321,545.94
5. Step 5: Solve for x
   x = 8,321,545.94/2,763.72
6. Step 6: Final answer
   x = 3,010.99