Finding the Fourth Proportional to 12,456.57, 17,185.73 and 8,215.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,456.57 : 17,185.73 = 8,215.62 : x
2. Step 2: Convert to fraction form
   12,456.57/17,185.73 = 8,215.62/x
3. Step 3: Cross multiply
   12,456.57x = 17,185.73 × 8,215.62
4. Step 4: Simplify right side
   12,456.57x = 141,191,427.10
5. Step 5: Solve for x
   x = 141,191,427.10/12,456.57
6. Step 6: Final answer
   x = 11,334.70