Finding the Fourth Proportional to 1,425.76, 1,967.55 and 828.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.76 : 1,967.55 = 828.37 : x
2. Step 2: Convert to fraction form
   1,425.76/1,967.55 = 828.37/x
3. Step 3: Cross multiply
   1,425.76x = 1,967.55 × 828.37
4. Step 4: Simplify right side
   1,425.76x = 1,629,859.39
5. Step 5: Solve for x
   x = 1,629,859.39/1,425.76
6. Step 6: Final answer
   x = 1,143.15