Finding the Fourth Proportional to 12,139.79, 16,751.76 and 8,954.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,139.79 : 16,751.76 = 8,954.82 : x
2. Step 2: Convert to fraction form
   12,139.79/16,751.76 = 8,954.82/x
3. Step 3: Cross multiply
   12,139.79x = 16,751.76 × 8,954.82
4. Step 4: Simplify right side
   12,139.79x = 150,008,961.90
5. Step 5: Solve for x
   x = 150,008,961.90/12,139.79
6. Step 6: Final answer
   x = 12,356.81