Finding the Fourth Proportional to 1,281.89, 1,768.98 and 722.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.89 : 1,768.98 = 722.35 : x
2. Step 2: Convert to fraction form
   1,281.89/1,768.98 = 722.35/x
3. Step 3: Cross multiply
   1,281.89x = 1,768.98 × 722.35
4. Step 4: Simplify right side
   1,281.89x = 1,277,822.70
5. Step 5: Solve for x
   x = 1,277,822.70/1,281.89
6. Step 6: Final answer
   x = 996.83