Finding the Fourth Proportional to 1,404.36, 1,938.15 and 957.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.36 : 1,938.15 = 957.21 : x
2. Step 2: Convert to fraction form
   1,404.36/1,938.15 = 957.21/x
3. Step 3: Cross multiply
   1,404.36x = 1,938.15 × 957.21
4. Step 4: Simplify right side
   1,404.36x = 1,855,216.56
5. Step 5: Solve for x
   x = 1,855,216.56/1,404.36
6. Step 6: Final answer
   x = 1,321.04