Finding the Fourth Proportional to 12,139.83, 16,743.38 and 7,947.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,139.83 : 16,743.38 = 7,947.27 : x
2. Step 2: Convert to fraction form
   12,139.83/16,743.38 = 7,947.27/x
3. Step 3: Cross multiply
   12,139.83x = 16,743.38 × 7,947.27
4. Step 4: Simplify right side
   12,139.83x = 133,064,121.84
5. Step 5: Solve for x
   x = 133,064,121.84/12,139.83
6. Step 6: Final answer
   x = 10,960.95