Finding the Fourth Proportional to 1,392.66, 1,922.22 and 803.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.66 : 1,922.22 = 803.57 : x
2. Step 2: Convert to fraction form
   1,392.66/1,922.22 = 803.57/x
3. Step 3: Cross multiply
   1,392.66x = 1,922.22 × 803.57
4. Step 4: Simplify right side
   1,392.66x = 1,544,628.71
5. Step 5: Solve for x
   x = 1,544,628.71/1,392.66
6. Step 6: Final answer
   x = 1,109.12