Finding the Fourth Proportional to 1,271.98, 1,755.28 and 712.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.98 : 1,755.28 = 712.45 : x
2. Step 2: Convert to fraction form
   1,271.98/1,755.28 = 712.45/x
3. Step 3: Cross multiply
   1,271.98x = 1,755.28 × 712.45
4. Step 4: Simplify right side
   1,271.98x = 1,250,547.45
5. Step 5: Solve for x
   x = 1,250,547.45/1,271.98
6. Step 6: Final answer
   x = 983.15