Finding the Fourth Proportional to 1,118.55, 1,678.43 and 541.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.55 : 1,678.43 = 541.42 : x
2. Step 2: Convert to fraction form
   1,118.55/1,678.43 = 541.42/x
3. Step 3: Cross multiply
   1,118.55x = 1,678.43 × 541.42
4. Step 4: Simplify right side
   1,118.55x = 908,735.57
5. Step 5: Solve for x
   x = 908,735.57/1,118.55
6. Step 6: Final answer
   x = 812.42