Finding the Fourth Proportional to 3,790.56, 5,687.42 and 1,815.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,790.56 : 5,687.42 = 1,815.20 : x
2. Step 2: Convert to fraction form
   3,790.56/5,687.42 = 1,815.20/x
3. Step 3: Cross multiply
   3,790.56x = 5,687.42 × 1,815.20
4. Step 4: Simplify right side
   3,790.56x = 10,323,767.27
5. Step 5: Solve for x
   x = 10,323,767.27/3,790.56
6. Step 6: Final answer
   x = 2,723.55