Finding the Fourth Proportional to 2,057.64, 2,839.83 and 1,218.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.64 : 2,839.83 = 1,218.72 : x
2. Step 2: Convert to fraction form
   2,057.64/2,839.83 = 1,218.72/x
3. Step 3: Cross multiply
   2,057.64x = 2,839.83 × 1,218.72
4. Step 4: Simplify right side
   2,057.64x = 3,460,957.62
5. Step 5: Solve for x
   x = 3,460,957.62/2,057.64
6. Step 6: Final answer
   x = 1,682.00