Finding the Fourth Proportional to 1,281.57, 1,768.56 and 722.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.57 : 1,768.56 = 722.04 : x
2. Step 2: Convert to fraction form
   1,281.57/1,768.56 = 722.04/x
3. Step 3: Cross multiply
   1,281.57x = 1,768.56 × 722.04
4. Step 4: Simplify right side
   1,281.57x = 1,276,971.06
5. Step 5: Solve for x
   x = 1,276,971.06/1,281.57
6. Step 6: Final answer
   x = 996.41