Finding the Fourth Proportional to 1,393.29, 1,922.78 and 803.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.29 : 1,922.78 = 803.81 : x
2. Step 2: Convert to fraction form
   1,393.29/1,922.78 = 803.81/x
3. Step 3: Cross multiply
   1,393.29x = 1,922.78 × 803.81
4. Step 4: Simplify right side
   1,393.29x = 1,545,556.61
5. Step 5: Solve for x
   x = 1,545,556.61/1,393.29
6. Step 6: Final answer
   x = 1,109.29