Finding the Fourth Proportional to 2,083.72, 3,123.66 and 1,057.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,083.72 : 3,123.66 = 1,057.48 : x
2. Step 2: Convert to fraction form
   2,083.72/3,123.66 = 1,057.48/x
3. Step 3: Cross multiply
   2,083.72x = 3,123.66 × 1,057.48
4. Step 4: Simplify right side
   2,083.72x = 3,303,207.98
5. Step 5: Solve for x
   x = 3,303,207.98/2,083.72
6. Step 6: Final answer
   x = 1,585.25