Finding the Fourth Proportional to 1,399.42, 1,930.48 and 957.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.42 : 1,930.48 = 957.34 : x
2. Step 2: Convert to fraction form
   1,399.42/1,930.48 = 957.34/x
3. Step 3: Cross multiply
   1,399.42x = 1,930.48 × 957.34
4. Step 4: Simplify right side
   1,399.42x = 1,848,125.72
5. Step 5: Solve for x
   x = 1,848,125.72/1,399.42
6. Step 6: Final answer
   x = 1,320.64