Finding the Fourth Proportional to 1,405.86, 1,940.56 and 964.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.86 : 1,940.56 = 964.42 : x
2. Step 2: Convert to fraction form
   1,405.86/1,940.56 = 964.42/x
3. Step 3: Cross multiply
   1,405.86x = 1,940.56 × 964.42
4. Step 4: Simplify right side
   1,405.86x = 1,871,514.88
5. Step 5: Solve for x
   x = 1,871,514.88/1,405.86
6. Step 6: Final answer
   x = 1,331.22