Finding the Fourth Proportional to 1,407.88, 1,942.54 and 818.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.88 : 1,942.54 = 818.08 : x
2. Step 2: Convert to fraction form
   1,407.88/1,942.54 = 818.08/x
3. Step 3: Cross multiply
   1,407.88x = 1,942.54 × 818.08
4. Step 4: Simplify right side
   1,407.88x = 1,589,139.32
5. Step 5: Solve for x
   x = 1,589,139.32/1,407.88
6. Step 6: Final answer
   x = 1,128.75