Finding the Fourth Proportional to 1,393.29, 1,920.37 and 1,275.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.29 : 1,920.37 = 1,275.59 : x
2. Step 2: Convert to fraction form
   1,393.29/1,920.37 = 1,275.59/x
3. Step 3: Cross multiply
   1,393.29x = 1,920.37 × 1,275.59
4. Step 4: Simplify right side
   1,393.29x = 2,449,604.77
5. Step 5: Solve for x
   x = 2,449,604.77/1,393.29
6. Step 6: Final answer
   x = 1,758.14