Finding the Fourth Proportional to 12,076.80, 18,100.62 and 8,781.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,076.80 : 18,100.62 = 8,781.72 : x
2. Step 2: Convert to fraction form
   12,076.80/18,100.62 = 8,781.72/x
3. Step 3: Cross multiply
   12,076.80x = 18,100.62 × 8,781.72
4. Step 4: Simplify right side
   12,076.80x = 158,954,576.67
5. Step 5: Solve for x
   x = 158,954,576.67/12,076.80
6. Step 6: Final answer
   x = 13,161.98