Finding the Fourth Proportional to 2,354.94, 3,534.57 and 1,123.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,354.94 : 3,534.57 = 1,123.20 : x
2. Step 2: Convert to fraction form
   2,354.94/3,534.57 = 1,123.20/x
3. Step 3: Cross multiply
   2,354.94x = 3,534.57 × 1,123.20
4. Step 4: Simplify right side
   2,354.94x = 3,970,029.02
5. Step 5: Solve for x
   x = 3,970,029.02/2,354.94
6. Step 6: Final answer
   x = 1,685.83