Finding the Fourth Proportional to 10,728.63, 16,087.32 and 4,487.49

Step by Step Solution

1. Step 1: Write the proportion equation
   10,728.63 : 16,087.32 = 4,487.49 : x
2. Step 2: Convert to fraction form
   10,728.63/16,087.32 = 4,487.49/x
3. Step 3: Cross multiply
   10,728.63x = 16,087.32 × 4,487.49
4. Step 4: Simplify right side
   10,728.63x = 72,191,687.63
5. Step 5: Solve for x
   x = 72,191,687.63/10,728.63
6. Step 6: Final answer
   x = 6,728.88