Finding the Fourth Proportional to 1,089.69, 1,624.88 and 960.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.69 : 1,624.88 = 960.18 : x
2. Step 2: Convert to fraction form
   1,089.69/1,624.88 = 960.18/x
3. Step 3: Cross multiply
   1,089.69x = 1,624.88 × 960.18
4. Step 4: Simplify right side
   1,089.69x = 1,560,172.48
5. Step 5: Solve for x
   x = 1,560,172.48/1,089.69
6. Step 6: Final answer
   x = 1,431.76