Finding the Fourth Proportional to 10,131.87, 13,949.66 and 8,871.62

Step by Step Solution

1. Step 1: Write the proportion equation
   10,131.87 : 13,949.66 = 8,871.62 : x
2. Step 2: Convert to fraction form
   10,131.87/13,949.66 = 8,871.62/x
3. Step 3: Cross multiply
   10,131.87x = 13,949.66 × 8,871.62
4. Step 4: Simplify right side
   10,131.87x = 123,755,968.54
5. Step 5: Solve for x
   x = 123,755,968.54/10,131.87
6. Step 6: Final answer
   x = 12,214.52