Finding the Fourth Proportional to 1,281.42, 1,767.89 and 839.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.42 : 1,767.89 = 839.59 : x
2. Step 2: Convert to fraction form
   1,281.42/1,767.89 = 839.59/x
3. Step 3: Cross multiply
   1,281.42x = 1,767.89 × 839.59
4. Step 4: Simplify right side
   1,281.42x = 1,484,300.44
5. Step 5: Solve for x
   x = 1,484,300.44/1,281.42
6. Step 6: Final answer
   x = 1,158.32