Finding the Fourth Proportional to 1,236.51, 1,855.17 and 659.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,236.51 : 1,855.17 = 659.25 : x
2. Step 2: Convert to fraction form
   1,236.51/1,855.17 = 659.25/x
3. Step 3: Cross multiply
   1,236.51x = 1,855.17 × 659.25
4. Step 4: Simplify right side
   1,236.51x = 1,223,020.82
5. Step 5: Solve for x
   x = 1,223,020.82/1,236.51
6. Step 6: Final answer
   x = 989.09