Finding the Fourth Proportional to 1,271.86, 1,755.25 and 712.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.86 : 1,755.25 = 712.31 : x
2. Step 2: Convert to fraction form
   1,271.86/1,755.25 = 712.31/x
3. Step 3: Cross multiply
   1,271.86x = 1,755.25 × 712.31
4. Step 4: Simplify right side
   1,271.86x = 1,250,275.96
5. Step 5: Solve for x
   x = 1,250,275.96/1,271.86
6. Step 6: Final answer
   x = 983.03