Finding the Fourth Proportional to 1,271.71, 1,754.98 and 712.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.71 : 1,754.98 = 712.15 : x
2. Step 2: Convert to fraction form
   1,271.71/1,754.98 = 712.15/x
3. Step 3: Cross multiply
   1,271.71x = 1,754.98 × 712.15
4. Step 4: Simplify right side
   1,271.71x = 1,249,806.85
5. Step 5: Solve for x
   x = 1,249,806.85/1,271.71
6. Step 6: Final answer
   x = 982.78