Finding the Fourth Proportional to 1,393.80, 1,923.40 and 804.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.80 : 1,923.40 = 804.43 : x
2. Step 2: Convert to fraction form
   1,393.80/1,923.40 = 804.43/x
3. Step 3: Cross multiply
   1,393.80x = 1,923.40 × 804.43
4. Step 4: Simplify right side
   1,393.80x = 1,547,227.02
5. Step 5: Solve for x
   x = 1,547,227.02/1,393.80
6. Step 6: Final answer
   x = 1,110.08