Finding the Fourth Proportional to 1,271.80, 1,755.18 and 712.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.80 : 1,755.18 = 712.42 : x
2. Step 2: Convert to fraction form
   1,271.80/1,755.18 = 712.42/x
3. Step 3: Cross multiply
   1,271.80x = 1,755.18 × 712.42
4. Step 4: Simplify right side
   1,271.80x = 1,250,425.34
5. Step 5: Solve for x
   x = 1,250,425.34/1,271.80
6. Step 6: Final answer
   x = 983.19