Finding the Fourth Proportional to 1,272.16, 1,755.52 and 712.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.16 : 1,755.52 = 712.56 : x
2. Step 2: Convert to fraction form
   1,272.16/1,755.52 = 712.56/x
3. Step 3: Cross multiply
   1,272.16x = 1,755.52 × 712.56
4. Step 4: Simplify right side
   1,272.16x = 1,250,913.33
5. Step 5: Solve for x
   x = 1,250,913.33/1,272.16
6. Step 6: Final answer
   x = 983.30