Finding the Fourth Proportional to 15,647.56, 21,588.24 and 8,928.34

Step by Step Solution

1. Step 1: Write the proportion equation
   15,647.56 : 21,588.24 = 8,928.34 : x
2. Step 2: Convert to fraction form
   15,647.56/21,588.24 = 8,928.34/x
3. Step 3: Cross multiply
   15,647.56x = 21,588.24 × 8,928.34
4. Step 4: Simplify right side
   15,647.56x = 192,747,146.72
5. Step 5: Solve for x
   x = 192,747,146.72/15,647.56
6. Step 6: Final answer
   x = 12,318.03