Finding the Fourth Proportional to 1,393.86, 1,923.42 and 804

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.86 : 1,923.42 = 804 : x
2. Step 2: Convert to fraction form
   1,393.86/1,923.42 = 804/x
3. Step 3: Cross multiply
   1,393.86x = 1,923.42 × 804
4. Step 4: Simplify right side
   1,393.86x = 1,546,429.68
5. Step 5: Solve for x
   x = 1,546,429.68/1,393.86
6. Step 6: Final answer
   x = 1,109.46