Finding the Fourth Proportional to 1,281.89, 1,920.99 and 734.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.89 : 1,920.99 = 734.23 : x
2. Step 2: Convert to fraction form
   1,281.89/1,920.99 = 734.23/x
3. Step 3: Cross multiply
   1,281.89x = 1,920.99 × 734.23
4. Step 4: Simplify right side
   1,281.89x = 1,410,443.69
5. Step 5: Solve for x
   x = 1,410,443.69/1,281.89
6. Step 6: Final answer
   x = 1,100.28