Finding the Fourth Proportional to 2,636.89, 3,955.02 and 689.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.89 : 3,955.02 = 689.25 : x
2. Step 2: Convert to fraction form
   2,636.89/3,955.02 = 689.25/x
3. Step 3: Cross multiply
   2,636.89x = 3,955.02 × 689.25
4. Step 4: Simplify right side
   2,636.89x = 2,725,997.54
5. Step 5: Solve for x
   x = 2,725,997.54/2,636.89
6. Step 6: Final answer
   x = 1,033.79