Finding the Fourth Proportional to 1,392.27, 1,920.56 and 1,251.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.27 : 1,920.56 = 1,251.33 : x
2. Step 2: Convert to fraction form
   1,392.27/1,920.56 = 1,251.33/x
3. Step 3: Cross multiply
   1,392.27x = 1,920.56 × 1,251.33
4. Step 4: Simplify right side
   1,392.27x = 2,403,248.09
5. Step 5: Solve for x
   x = 2,403,248.09/1,392.27
6. Step 6: Final answer
   x = 1,726.14