Finding the Fourth Proportional to 1,281.72, 1,920.78 and 733.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.72 : 1,920.78 = 733.08 : x
2. Step 2: Convert to fraction form
   1,281.72/1,920.78 = 733.08/x
3. Step 3: Cross multiply
   1,281.72x = 1,920.78 × 733.08
4. Step 4: Simplify right side
   1,281.72x = 1,408,085.40
5. Step 5: Solve for x
   x = 1,408,085.40/1,281.72
6. Step 6: Final answer
   x = 1,098.59