Finding the Fourth Proportional to 1,082.88, 1,620.54 and 885.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,082.88 : 1,620.54 = 885.60 : x
2. Step 2: Convert to fraction form
   1,082.88/1,620.54 = 885.60/x
3. Step 3: Cross multiply
   1,082.88x = 1,620.54 × 885.60
4. Step 4: Simplify right side
   1,082.88x = 1,435,150.22
5. Step 5: Solve for x
   x = 1,435,150.22/1,082.88
6. Step 6: Final answer
   x = 1,325.31