Finding the Fourth Proportional to 1,118.34, 1,674.42 and 843.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.34 : 1,674.42 = 843.60 : x
2. Step 2: Convert to fraction form
   1,118.34/1,674.42 = 843.60/x
3. Step 3: Cross multiply
   1,118.34x = 1,674.42 × 843.60
4. Step 4: Simplify right side
   1,118.34x = 1,412,540.71
5. Step 5: Solve for x
   x = 1,412,540.71/1,118.34
6. Step 6: Final answer
   x = 1,263.07