Finding the Fourth Proportional to 1,271.34, 1,754.28 and 711.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.34 : 1,754.28 = 711.72 : x
2. Step 2: Convert to fraction form
   1,271.34/1,754.28 = 711.72/x
3. Step 3: Cross multiply
   1,271.34x = 1,754.28 × 711.72
4. Step 4: Simplify right side
   1,271.34x = 1,248,556.16
5. Step 5: Solve for x
   x = 1,248,556.16/1,271.34
6. Step 6: Final answer
   x = 982.08