Finding the Fourth Proportional to 1,272.28, 1,755.81 and 712.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.28 : 1,755.81 = 712.71 : x
2. Step 2: Convert to fraction form
   1,272.28/1,755.81 = 712.71/x
3. Step 3: Cross multiply
   1,272.28x = 1,755.81 × 712.71
4. Step 4: Simplify right side
   1,272.28x = 1,251,379.78
5. Step 5: Solve for x
   x = 1,251,379.78/1,272.28
6. Step 6: Final answer
   x = 983.58