Finding the Fourth Proportional to 12,120.17, 16,717.61 and 7,863.63

Step by Step Solution

1. Step 1: Write the proportion equation
   12,120.17 : 16,717.61 = 7,863.63 : x
2. Step 2: Convert to fraction form
   12,120.17/16,717.61 = 7,863.63/x
3. Step 3: Cross multiply
   12,120.17x = 16,717.61 × 7,863.63
4. Step 4: Simplify right side
   12,120.17x = 131,461,056.49
5. Step 5: Solve for x
   x = 131,461,056.49/12,120.17
6. Step 6: Final answer
   x = 10,846.47