Finding the Fourth Proportional to 1,259.62, 1,737.72 and 839.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,259.62 : 1,737.72 = 839.57 : x
2. Step 2: Convert to fraction form
   1,259.62/1,737.72 = 839.57/x
3. Step 3: Cross multiply
   1,259.62x = 1,737.72 × 839.57
4. Step 4: Simplify right side
   1,259.62x = 1,458,928.89
5. Step 5: Solve for x
   x = 1,458,928.89/1,259.62
6. Step 6: Final answer
   x = 1,158.23