Finding the Fourth Proportional to 1,258.29, 1,735.59 and 885.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.29 : 1,735.59 = 885.30 : x
2. Step 2: Convert to fraction form
   1,258.29/1,735.59 = 885.30/x
3. Step 3: Cross multiply
   1,258.29x = 1,735.59 × 885.30
4. Step 4: Simplify right side
   1,258.29x = 1,536,517.83
5. Step 5: Solve for x
   x = 1,536,517.83/1,258.29
6. Step 6: Final answer
   x = 1,221.12