Finding the Fourth Proportional to 2,353.70, 3,529.71 and 1,121.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,353.70 : 3,529.71 = 1,121.72 : x
2. Step 2: Convert to fraction form
   2,353.70/3,529.71 = 1,121.72/x
3. Step 3: Cross multiply
   2,353.70x = 3,529.71 × 1,121.72
4. Step 4: Simplify right side
   2,353.70x = 3,959,346.30
5. Step 5: Solve for x
   x = 3,959,346.30/2,353.70
6. Step 6: Final answer
   x = 1,682.18