Finding the Fourth Proportional to 1,075.89, 1,605.51 and 959.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,075.89 : 1,605.51 = 959.40 : x
2. Step 2: Convert to fraction form
   1,075.89/1,605.51 = 959.40/x
3. Step 3: Cross multiply
   1,075.89x = 1,605.51 × 959.40
4. Step 4: Simplify right side
   1,075.89x = 1,540,333.51
5. Step 5: Solve for x
   x = 1,540,333.51/1,075.89
6. Step 6: Final answer
   x = 1,431.69