Finding the Fourth Proportional to 1,393.72, 1,923.60 and 804.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.72 : 1,923.60 = 804.28 : x
2. Step 2: Convert to fraction form
   1,393.72/1,923.60 = 804.28/x
3. Step 3: Cross multiply
   1,393.72x = 1,923.60 × 804.28
4. Step 4: Simplify right side
   1,393.72x = 1,547,113.01
5. Step 5: Solve for x
   x = 1,547,113.01/1,393.72
6. Step 6: Final answer
   x = 1,110.06