Finding the Fourth Proportional to 1,271.78, 1,755.04 and 712.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.78 : 1,755.04 = 712.24 : x
2. Step 2: Convert to fraction form
   1,271.78/1,755.04 = 712.24/x
3. Step 3: Cross multiply
   1,271.78x = 1,755.04 × 712.24
4. Step 4: Simplify right side
   1,271.78x = 1,250,009.69
5. Step 5: Solve for x
   x = 1,250,009.69/1,271.78
6. Step 6: Final answer
   x = 982.88