Finding the Fourth Proportional to 2,355.86, 3,534.80 and 1,123.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,355.86 : 3,534.80 = 1,123.28 : x
2. Step 2: Convert to fraction form
   2,355.86/3,534.80 = 1,123.28/x
3. Step 3: Cross multiply
   2,355.86x = 3,534.80 × 1,123.28
4. Step 4: Simplify right side
   2,355.86x = 3,970,570.14
5. Step 5: Solve for x
   x = 3,970,570.14/2,355.86
6. Step 6: Final answer
   x = 1,685.40