Finding the Fourth Proportional to 1,072.56, 1,479.72 and 722.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.56 : 1,479.72 = 722.64 : x
2. Step 2: Convert to fraction form
   1,072.56/1,479.72 = 722.64/x
3. Step 3: Cross multiply
   1,072.56x = 1,479.72 × 722.64
4. Step 4: Simplify right side
   1,072.56x = 1,069,304.86
5. Step 5: Solve for x
   x = 1,069,304.86/1,072.56
6. Step 6: Final answer
   x = 996.97