Finding the Fourth Proportional to 1,256.69, 1,734.28 and 697.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,256.69 : 1,734.28 = 697.12 : x
2. Step 2: Convert to fraction form
   1,256.69/1,734.28 = 697.12/x
3. Step 3: Cross multiply
   1,256.69x = 1,734.28 × 697.12
4. Step 4: Simplify right side
   1,256.69x = 1,208,995.20
5. Step 5: Solve for x
   x = 1,208,995.20/1,256.69
6. Step 6: Final answer
   x = 962.05