Finding the Fourth Proportional to 1,258.56, 1,737.18 and 839.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.56 : 1,737.18 = 839.52 : x
2. Step 2: Convert to fraction form
   1,258.56/1,737.18 = 839.52/x
3. Step 3: Cross multiply
   1,258.56x = 1,737.18 × 839.52
4. Step 4: Simplify right side
   1,258.56x = 1,458,397.35
5. Step 5: Solve for x
   x = 1,458,397.35/1,258.56
6. Step 6: Final answer
   x = 1,158.78