Finding the Fourth Proportional to 1,339.54, 1,847.38 and 842.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.54 : 1,847.38 = 842.23 : x
2. Step 2: Convert to fraction form
   1,339.54/1,847.38 = 842.23/x
3. Step 3: Cross multiply
   1,339.54x = 1,847.38 × 842.23
4. Step 4: Simplify right side
   1,339.54x = 1,555,918.86
5. Step 5: Solve for x
   x = 1,555,918.86/1,339.54
6. Step 6: Final answer
   x = 1,161.53