Finding the Fourth Proportional to 2,940.81, 4,388.88 and 2,821.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,940.81 : 4,388.88 = 2,821.74 : x
2. Step 2: Convert to fraction form
   2,940.81/4,388.88 = 2,821.74/x
3. Step 3: Cross multiply
   2,940.81x = 4,388.88 × 2,821.74
4. Step 4: Simplify right side
   2,940.81x = 12,384,278.25
5. Step 5: Solve for x
   x = 12,384,278.25/2,940.81
6. Step 6: Final answer
   x = 4,211.18