Finding the Fourth Proportional to 13,962.76, 20,916.72 and 8,107.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,962.76 : 20,916.72 = 8,107.12 : x
2. Step 2: Convert to fraction form
   13,962.76/20,916.72 = 8,107.12/x
3. Step 3: Cross multiply
   13,962.76x = 20,916.72 × 8,107.12
4. Step 4: Simplify right side
   13,962.76x = 169,574,359.05
5. Step 5: Solve for x
   x = 169,574,359.05/13,962.76
6. Step 6: Final answer
   x = 12,144.76