Finding the Fourth Proportional to 1,393.71, 1,923.38 and 804.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.71 : 1,923.38 = 804.30 : x
2. Step 2: Convert to fraction form
   1,393.71/1,923.38 = 804.30/x
3. Step 3: Cross multiply
   1,393.71x = 1,923.38 × 804.30
4. Step 4: Simplify right side
   1,393.71x = 1,546,970.51
5. Step 5: Solve for x
   x = 1,546,970.51/1,393.71
6. Step 6: Final answer
   x = 1,109.97