Finding the Fourth Proportional to 2,520.72, 3,777.84 and 1,057.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,520.72 : 3,777.84 = 1,057.86 : x
2. Step 2: Convert to fraction form
   2,520.72/3,777.84 = 1,057.86/x
3. Step 3: Cross multiply
   2,520.72x = 3,777.84 × 1,057.86
4. Step 4: Simplify right side
   2,520.72x = 3,996,425.82
5. Step 5: Solve for x
   x = 3,996,425.82/2,520.72
6. Step 6: Final answer
   x = 1,585.43