Finding the Fourth Proportional to 13,487.59, 18,615.31 and 8,456.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,487.59 : 18,615.31 = 8,456.18 : x
2. Step 2: Convert to fraction form
   13,487.59/18,615.31 = 8,456.18/x
3. Step 3: Cross multiply
   13,487.59x = 18,615.31 × 8,456.18
4. Step 4: Simplify right side
   13,487.59x = 157,414,297.90
5. Step 5: Solve for x
   x = 157,414,297.90/13,487.59
6. Step 6: Final answer
   x = 11,671.05