Finding the Fourth Proportional to 1,418.33, 1,956.67 and 828.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.33 : 1,956.67 = 828.61 : x
2. Step 2: Convert to fraction form
   1,418.33/1,956.67 = 828.61/x
3. Step 3: Cross multiply
   1,418.33x = 1,956.67 × 828.61
4. Step 4: Simplify right side
   1,418.33x = 1,621,309.37
5. Step 5: Solve for x
   x = 1,621,309.37/1,418.33
6. Step 6: Final answer
   x = 1,143.11