Finding the Fourth Proportional to 2,154.58, 3,229.71 and 1,057.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,154.58 : 3,229.71 = 1,057.30 : x
2. Step 2: Convert to fraction form
   2,154.58/3,229.71 = 1,057.30/x
3. Step 3: Cross multiply
   2,154.58x = 3,229.71 × 1,057.30
4. Step 4: Simplify right side
   2,154.58x = 3,414,772.38
5. Step 5: Solve for x
   x = 3,414,772.38/2,154.58
6. Step 6: Final answer
   x = 1,584.89