Finding the Fourth Proportional to 3,152.72, 4,728.85 and 961.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,152.72 : 4,728.85 = 961.31 : x
2. Step 2: Convert to fraction form
   3,152.72/4,728.85 = 961.31/x
3. Step 3: Cross multiply
   3,152.72x = 4,728.85 × 961.31
4. Step 4: Simplify right side
   3,152.72x = 4,545,900.21
5. Step 5: Solve for x
   x = 4,545,900.21/3,152.72
6. Step 6: Final answer
   x = 1,441.90