Finding the Fourth Proportional to 15,638.72, 21,581.79 and 8,565.08

Step by Step Solution

1. Step 1: Write the proportion equation
   15,638.72 : 21,581.79 = 8,565.08 : x
2. Step 2: Convert to fraction form
   15,638.72/21,581.79 = 8,565.08/x
3. Step 3: Cross multiply
   15,638.72x = 21,581.79 × 8,565.08
4. Step 4: Simplify right side
   15,638.72x = 184,849,757.89
5. Step 5: Solve for x
   x = 184,849,757.89/15,638.72
6. Step 6: Final answer
   x = 11,820.01