Finding the Fourth Proportional to 1,392.53, 1,921.22 and 803.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.53 : 1,921.22 = 803.05 : x
2. Step 2: Convert to fraction form
   1,392.53/1,921.22 = 803.05/x
3. Step 3: Cross multiply
   1,392.53x = 1,921.22 × 803.05
4. Step 4: Simplify right side
   1,392.53x = 1,542,835.72
5. Step 5: Solve for x
   x = 1,542,835.72/1,392.53
6. Step 6: Final answer
   x = 1,107.94