Finding the Fourth Proportional to 13,155.89, 18,157.91 and 8,680.23

Step by Step Solution

1. Step 1: Write the proportion equation
   13,155.89 : 18,157.91 = 8,680.23 : x
2. Step 2: Convert to fraction form
   13,155.89/18,157.91 = 8,680.23/x
3. Step 3: Cross multiply
   13,155.89x = 18,157.91 × 8,680.23
4. Step 4: Simplify right side
   13,155.89x = 157,614,791.72
5. Step 5: Solve for x
   x = 157,614,791.72/13,155.89
6. Step 6: Final answer
   x = 11,980.55