Finding the Fourth Proportional to 2,355.28, 3,533.72 and 1,123.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,355.28 : 3,533.72 = 1,123.60 : x
2. Step 2: Convert to fraction form
   2,355.28/3,533.72 = 1,123.60/x
3. Step 3: Cross multiply
   2,355.28x = 3,533.72 × 1,123.60
4. Step 4: Simplify right side
   2,355.28x = 3,970,487.79
5. Step 5: Solve for x
   x = 3,970,487.79/2,355.28
6. Step 6: Final answer
   x = 1,685.78