Finding the Fourth Proportional to 15,630.72, 21,570.41 and 8,557.17

Step by Step Solution

1. Step 1: Write the proportion equation
   15,630.72 : 21,570.41 = 8,557.17 : x
2. Step 2: Convert to fraction form
   15,630.72/21,570.41 = 8,557.17/x
3. Step 3: Cross multiply
   15,630.72x = 21,570.41 × 8,557.17
4. Step 4: Simplify right side
   15,630.72x = 184,581,665.34
5. Step 5: Solve for x
   x = 184,581,665.34/15,630.72
6. Step 6: Final answer
   x = 11,808.90