Finding the Fourth Proportional to 2,133.72, 3,201.72 and 835.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,133.72 : 3,201.72 = 835.20 : x
2. Step 2: Convert to fraction form
   2,133.72/3,201.72 = 835.20/x
3. Step 3: Cross multiply
   2,133.72x = 3,201.72 × 835.20
4. Step 4: Simplify right side
   2,133.72x = 2,674,076.54
5. Step 5: Solve for x
   x = 2,674,076.54/2,133.72
6. Step 6: Final answer
   x = 1,253.25