Finding the Fourth Proportional to 1,399.97, 1,932.30 and 810.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.97 : 1,932.30 = 810.42 : x
2. Step 2: Convert to fraction form
   1,399.97/1,932.30 = 810.42/x
3. Step 3: Cross multiply
   1,399.97x = 1,932.30 × 810.42
4. Step 4: Simplify right side
   1,399.97x = 1,565,974.57
5. Step 5: Solve for x
   x = 1,565,974.57/1,399.97
6. Step 6: Final answer
   x = 1,118.58