Finding the Fourth Proportional to 1,681.42, 2,320.40 and 963.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,681.42 : 2,320.40 = 963.72 : x
2. Step 2: Convert to fraction form
   1,681.42/2,320.40 = 963.72/x
3. Step 3: Cross multiply
   1,681.42x = 2,320.40 × 963.72
4. Step 4: Simplify right side
   1,681.42x = 2,236,215.89
5. Step 5: Solve for x
   x = 2,236,215.89/1,681.42
6. Step 6: Final answer
   x = 1,329.96