Finding the Fourth Proportional to 1,355.72, 1,871.35 and 963.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.72 : 1,871.35 = 963.88 : x
2. Step 2: Convert to fraction form
   1,355.72/1,871.35 = 963.88/x
3. Step 3: Cross multiply
   1,355.72x = 1,871.35 × 963.88
4. Step 4: Simplify right side
   1,355.72x = 1,803,756.84
5. Step 5: Solve for x
   x = 1,803,756.84/1,355.72
6. Step 6: Final answer
   x = 1,330.48