Finding the Fourth Proportional to 957.69, 1,436.69 and 409.88

Step by Step Solution

1. Step 1: Write the proportion equation
   957.69 : 1,436.69 = 409.88 : x
2. Step 2: Convert to fraction form
   957.69/1,436.69 = 409.88/x
3. Step 3: Cross multiply
   957.69x = 1,436.69 × 409.88
4. Step 4: Simplify right side
   957.69x = 588,870.50
5. Step 5: Solve for x
   x = 588,870.50/957.69
6. Step 6: Final answer
   x = 614.89