Finding the Fourth Proportional to 2,355.90, 3,533.89 and 1,123.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,355.90 : 3,533.89 = 1,123.44 : x
2. Step 2: Convert to fraction form
   2,355.90/3,533.89 = 1,123.44/x
3. Step 3: Cross multiply
   2,355.90x = 3,533.89 × 1,123.44
4. Step 4: Simplify right side
   2,355.90x = 3,970,113.38
5. Step 5: Solve for x
   x = 3,970,113.38/2,355.90
6. Step 6: Final answer
   x = 1,685.18