Finding the Fourth Proportional to 2,940.80, 4,055.88 and 2,144.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,940.80 : 4,055.88 = 2,144.12 : x
2. Step 2: Convert to fraction form
   2,940.80/4,055.88 = 2,144.12/x
3. Step 3: Cross multiply
   2,940.80x = 4,055.88 × 2,144.12
4. Step 4: Simplify right side
   2,940.80x = 8,696,293.43
5. Step 5: Solve for x
   x = 8,696,293.43/2,940.80
6. Step 6: Final answer
   x = 2,957.12