Finding the Fourth Proportional to 2,057.41, 2,839.05 and 1,218.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.41 : 2,839.05 = 1,218.04 : x
2. Step 2: Convert to fraction form
   2,057.41/2,839.05 = 1,218.04/x
3. Step 3: Cross multiply
   2,057.41x = 2,839.05 × 1,218.04
4. Step 4: Simplify right side
   2,057.41x = 3,458,076.46
5. Step 5: Solve for x
   x = 3,458,076.46/2,057.41
6. Step 6: Final answer
   x = 1,680.79