Finding the Fourth Proportional to 13,116.71, 18,108.42 and 8,653.43

Step by Step Solution

1. Step 1: Write the proportion equation
   13,116.71 : 18,108.42 = 8,653.43 : x
2. Step 2: Convert to fraction form
   13,116.71/18,108.42 = 8,653.43/x
3. Step 3: Cross multiply
   13,116.71x = 18,108.42 × 8,653.43
4. Step 4: Simplify right side
   13,116.71x = 156,699,944.88
5. Step 5: Solve for x
   x = 156,699,944.88/13,116.71
6. Step 6: Final answer
   x = 11,946.59