Finding the Fourth Proportional to 1,309.52, 1,964.42 and 443.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.52 : 1,964.42 = 443.86 : x
2. Step 2: Convert to fraction form
   1,309.52/1,964.42 = 443.86/x
3. Step 3: Cross multiply
   1,309.52x = 1,964.42 × 443.86
4. Step 4: Simplify right side
   1,309.52x = 871,927.46
5. Step 5: Solve for x
   x = 871,927.46/1,309.52
6. Step 6: Final answer
   x = 665.84