Finding the Fourth Proportional to 3,690.30, 5,534.57 and 1,057.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,690.30 : 5,534.57 = 1,057.72 : x
2. Step 2: Convert to fraction form
   3,690.30/5,534.57 = 1,057.72/x
3. Step 3: Cross multiply
   3,690.30x = 5,534.57 × 1,057.72
4. Step 4: Simplify right side
   3,690.30x = 5,854,025.38
5. Step 5: Solve for x
   x = 5,854,025.38/3,690.30
6. Step 6: Final answer
   x = 1,586.33