Finding the Fourth Proportional to 1,259.58, 1,739.69 and 839.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,259.58 : 1,739.69 = 839.25 : x
2. Step 2: Convert to fraction form
   1,259.58/1,739.69 = 839.25/x
3. Step 3: Cross multiply
   1,259.58x = 1,739.69 × 839.25
4. Step 4: Simplify right side
   1,259.58x = 1,460,033.78
5. Step 5: Solve for x
   x = 1,460,033.78/1,259.58
6. Step 6: Final answer
   x = 1,159.14