Finding the Fourth Proportional to 2,057.56, 2,839.30 and 1,393.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.56 : 2,839.30 = 1,393.36 : x
2. Step 2: Convert to fraction form
   2,057.56/2,839.30 = 1,393.36/x
3. Step 3: Cross multiply
   2,057.56x = 2,839.30 × 1,393.36
4. Step 4: Simplify right side
   2,057.56x = 3,956,167.05
5. Step 5: Solve for x
   x = 3,956,167.05/2,057.56
6. Step 6: Final answer
   x = 1,922.75