Finding the Fourth Proportional to 2,356.69, 3,533.20 and 1,057.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,356.69 : 3,533.20 = 1,057.25 : x
2. Step 2: Convert to fraction form
   2,356.69/3,533.20 = 1,057.25/x
3. Step 3: Cross multiply
   2,356.69x = 3,533.20 × 1,057.25
4. Step 4: Simplify right side
   2,356.69x = 3,735,475.70
5. Step 5: Solve for x
   x = 3,735,475.70/2,356.69
6. Step 6: Final answer
   x = 1,585.05