Finding the Fourth Proportional to 1,721.55, 2,375.45 and 965.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,721.55 : 2,375.45 = 965.31 : x
2. Step 2: Convert to fraction form
   1,721.55/2,375.45 = 965.31/x
3. Step 3: Cross multiply
   1,721.55x = 2,375.45 × 965.31
4. Step 4: Simplify right side
   1,721.55x = 2,293,040.81
5. Step 5: Solve for x
   x = 2,293,040.81/1,721.55
6. Step 6: Final answer
   x = 1,331.96