Finding the Fourth Proportional to 2,057.12, 2,835.86 and 1,357.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.12 : 2,835.86 = 1,357.28 : x
2. Step 2: Convert to fraction form
   2,057.12/2,835.86 = 1,357.28/x
3. Step 3: Cross multiply
   2,057.12x = 2,835.86 × 1,357.28
4. Step 4: Simplify right side
   2,057.12x = 3,849,056.06
5. Step 5: Solve for x
   x = 3,849,056.06/2,057.12
6. Step 6: Final answer
   x = 1,871.09