Finding the Fourth Proportional to 1,211.69, 1,671.50 and 818.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,211.69 : 1,671.50 = 818.03 : x
2. Step 2: Convert to fraction form
   1,211.69/1,671.50 = 818.03/x
3. Step 3: Cross multiply
   1,211.69x = 1,671.50 × 818.03
4. Step 4: Simplify right side
   1,211.69x = 1,367,343.37
5. Step 5: Solve for x
   x = 1,367,343.37/1,211.69
6. Step 6: Final answer
   x = 1,128.46