Finding the Fourth Proportional to 1,091.25, 1,504.89 and 842.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.25 : 1,504.89 = 842.18 : x
2. Step 2: Convert to fraction form
   1,091.25/1,504.89 = 842.18/x
3. Step 3: Cross multiply
   1,091.25x = 1,504.89 × 842.18
4. Step 4: Simplify right side
   1,091.25x = 1,267,380.74
5. Step 5: Solve for x
   x = 1,267,380.74/1,091.25
6. Step 6: Final answer
   x = 1,161.40