Finding the Fourth Proportional to 1,271.31, 1,754.42 and 711.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.31 : 1,754.42 = 711.81 : x
2. Step 2: Convert to fraction form
   1,271.31/1,754.42 = 711.81/x
3. Step 3: Cross multiply
   1,271.31x = 1,754.42 × 711.81
4. Step 4: Simplify right side
   1,271.31x = 1,248,813.70
5. Step 5: Solve for x
   x = 1,248,813.70/1,271.31
6. Step 6: Final answer
   x = 982.30