Finding the Fourth Proportional to 1,399.99, 1,929.61 and 957.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.99 : 1,929.61 = 957.13 : x
2. Step 2: Convert to fraction form
   1,399.99/1,929.61 = 957.13/x
3. Step 3: Cross multiply
   1,399.99x = 1,929.61 × 957.13
4. Step 4: Simplify right side
   1,399.99x = 1,846,873.19
5. Step 5: Solve for x
   x = 1,846,873.19/1,399.99
6. Step 6: Final answer
   x = 1,319.20