Finding the Fourth Proportional to 1,281.67, 1,768.30 and 722.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.67 : 1,768.30 = 722.05 : x
2. Step 2: Convert to fraction form
   1,281.67/1,768.30 = 722.05/x
3. Step 3: Cross multiply
   1,281.67x = 1,768.30 × 722.05
4. Step 4: Simplify right side
   1,281.67x = 1,276,801.02
5. Step 5: Solve for x
   x = 1,276,801.02/1,281.67
6. Step 6: Final answer
   x = 996.20