Finding the Fourth Proportional to 1,393.31, 1,922.65 and 803.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.31 : 1,922.65 = 803.89 : x
2. Step 2: Convert to fraction form
   1,393.31/1,922.65 = 803.89/x
3. Step 3: Cross multiply
   1,393.31x = 1,922.65 × 803.89
4. Step 4: Simplify right side
   1,393.31x = 1,545,599.11
5. Step 5: Solve for x
   x = 1,545,599.11/1,393.31
6. Step 6: Final answer
   x = 1,109.30