Finding the Fourth Proportional to 839.89, 1,159.34 and 673.81

Step by Step Solution

1. Step 1: Write the proportion equation
   839.89 : 1,159.34 = 673.81 : x
2. Step 2: Convert to fraction form
   839.89/1,159.34 = 673.81/x
3. Step 3: Cross multiply
   839.89x = 1,159.34 × 673.81
4. Step 4: Simplify right side
   839.89x = 781,174.89
5. Step 5: Solve for x
   x = 781,174.89/839.89
6. Step 6: Final answer
   x = 930.09