Finding the Fourth Proportional to 12,887.04, 17,790.72 and 7,921.92

Step by Step Solution

1. Step 1: Write the proportion equation
   12,887.04 : 17,790.72 = 7,921.92 : x
2. Step 2: Convert to fraction form
   12,887.04/17,790.72 = 7,921.92/x
3. Step 3: Cross multiply
   12,887.04x = 17,790.72 × 7,921.92
4. Step 4: Simplify right side
   12,887.04x = 140,936,660.58
5. Step 5: Solve for x
   x = 140,936,660.58/12,887.04
6. Step 6: Final answer
   x = 10,936.31