Finding the Fourth Proportional to 15,404.56, 21,259.27 and 8,687.73

Step by Step Solution

1. Step 1: Write the proportion equation
   15,404.56 : 21,259.27 = 8,687.73 : x
2. Step 2: Convert to fraction form
   15,404.56/21,259.27 = 8,687.73/x
3. Step 3: Cross multiply
   15,404.56x = 21,259.27 × 8,687.73
4. Step 4: Simplify right side
   15,404.56x = 184,694,797.76
5. Step 5: Solve for x
   x = 184,694,797.76/15,404.56
6. Step 6: Final answer
   x = 11,989.62