Finding the Fourth Proportional to 2,787.72, 4,182.12 and 1,057.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,787.72 : 4,182.12 = 1,057.56 : x
2. Step 2: Convert to fraction form
   2,787.72/4,182.12 = 1,057.56/x
3. Step 3: Cross multiply
   2,787.72x = 4,182.12 × 1,057.56
4. Step 4: Simplify right side
   2,787.72x = 4,422,842.83
5. Step 5: Solve for x
   x = 4,422,842.83/2,787.72
6. Step 6: Final answer
   x = 1,586.54