Finding the Fourth Proportional to 2,057.94, 2,839.72 and 1,218.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.94 : 2,839.72 = 1,218.68 : x
2. Step 2: Convert to fraction form
   2,057.94/2,839.72 = 1,218.68/x
3. Step 3: Cross multiply
   2,057.94x = 2,839.72 × 1,218.68
4. Step 4: Simplify right side
   2,057.94x = 3,460,703.88
5. Step 5: Solve for x
   x = 3,460,703.88/2,057.94
6. Step 6: Final answer
   x = 1,681.64