Finding the Fourth Proportional to 15,620.72, 21,554.03 and 8,906.49

Step by Step Solution

1. Step 1: Write the proportion equation
   15,620.72 : 21,554.03 = 8,906.49 : x
2. Step 2: Convert to fraction form
   15,620.72/21,554.03 = 8,906.49/x
3. Step 3: Cross multiply
   15,620.72x = 21,554.03 × 8,906.49
4. Step 4: Simplify right side
   15,620.72x = 191,970,774.92
5. Step 5: Solve for x
   x = 191,970,774.92/15,620.72
6. Step 6: Final answer
   x = 12,289.50