Finding the Fourth Proportional to 1,227.31, 1,693.72 and 696.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,227.31 : 1,693.72 = 696.18 : x
2. Step 2: Convert to fraction form
   1,227.31/1,693.72 = 696.18/x
3. Step 3: Cross multiply
   1,227.31x = 1,693.72 × 696.18
4. Step 4: Simplify right side
   1,227.31x = 1,179,124.96
5. Step 5: Solve for x
   x = 1,179,124.96/1,227.31
6. Step 6: Final answer
   x = 960.74