Finding the Fourth Proportional to 8,728.72, 12,041.52 and 5,189.92

Step by Step Solution

1. Step 1: Write the proportion equation
   8,728.72 : 12,041.52 = 5,189.92 : x
2. Step 2: Convert to fraction form
   8,728.72/12,041.52 = 5,189.92/x
3. Step 3: Cross multiply
   8,728.72x = 12,041.52 × 5,189.92
4. Step 4: Simplify right side
   8,728.72x = 62,494,525.48
5. Step 5: Solve for x
   x = 62,494,525.48/8,728.72
6. Step 6: Final answer
   x = 7,159.64