Finding the Fourth Proportional to 1,392.68, 1,922.25 and 803.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.68 : 1,922.25 = 803.57 : x
2. Step 2: Convert to fraction form
   1,392.68/1,922.25 = 803.57/x
3. Step 3: Cross multiply
   1,392.68x = 1,922.25 × 803.57
4. Step 4: Simplify right side
   1,392.68x = 1,544,658.41
5. Step 5: Solve for x
   x = 1,544,658.41/1,392.68
6. Step 6: Final answer
   x = 1,109.13