Finding the Fourth Proportional to 1,393.68, 1,923.76 and 804.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.68 : 1,923.76 = 804.45 : x
2. Step 2: Convert to fraction form
   1,393.68/1,923.76 = 804.45/x
3. Step 3: Cross multiply
   1,393.68x = 1,923.76 × 804.45
4. Step 4: Simplify right side
   1,393.68x = 1,547,568.73
5. Step 5: Solve for x
   x = 1,547,568.73/1,393.68
6. Step 6: Final answer
   x = 1,110.42