Finding the Fourth Proportional to 1,393.89, 1,923.39 and 804.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.89 : 1,923.39 = 804.35 : x
2. Step 2: Convert to fraction form
   1,393.89/1,923.39 = 804.35/x
3. Step 3: Cross multiply
   1,393.89x = 1,923.39 × 804.35
4. Step 4: Simplify right side
   1,393.89x = 1,547,069.13
5. Step 5: Solve for x
   x = 1,547,069.13/1,393.89
6. Step 6: Final answer
   x = 1,109.89