Finding the Fourth Proportional to 2,940.72, 4,056.66 and 1,821.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,940.72 : 4,056.66 = 1,821.30 : x
2. Step 2: Convert to fraction form
   2,940.72/4,056.66 = 1,821.30/x
3. Step 3: Cross multiply
   2,940.72x = 4,056.66 × 1,821.30
4. Step 4: Simplify right side
   2,940.72x = 7,388,394.86
5. Step 5: Solve for x
   x = 7,388,394.86/2,940.72
6. Step 6: Final answer
   x = 2,512.44