Finding the Fourth Proportional to 1,393.84, 1,923.36 and 804.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.84 : 1,923.36 = 804.40 : x
2. Step 2: Convert to fraction form
   1,393.84/1,923.36 = 804.40/x
3. Step 3: Cross multiply
   1,393.84x = 1,923.36 × 804.40
4. Step 4: Simplify right side
   1,393.84x = 1,547,150.78
5. Step 5: Solve for x
   x = 1,547,150.78/1,393.84
6. Step 6: Final answer
   x = 1,109.99