Finding the Fourth Proportional to 1,407.97, 1,942.69 and 818.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.97 : 1,942.69 = 818.20 : x
2. Step 2: Convert to fraction form
   1,407.97/1,942.69 = 818.20/x
3. Step 3: Cross multiply
   1,407.97x = 1,942.69 × 818.20
4. Step 4: Simplify right side
   1,407.97x = 1,589,508.96
5. Step 5: Solve for x
   x = 1,589,508.96/1,407.97
6. Step 6: Final answer
   x = 1,128.94