Finding the Fourth Proportional to 12,757.52, 17,615.88 and 12,105.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,757.52 : 17,615.88 = 12,105.20 : x
2. Step 2: Convert to fraction form
   12,757.52/17,615.88 = 12,105.20/x
3. Step 3: Cross multiply
   12,757.52x = 17,615.88 × 12,105.20
4. Step 4: Simplify right side
   12,757.52x = 213,243,750.58
5. Step 5: Solve for x
   x = 213,243,750.58/12,757.52
6. Step 6: Final answer
   x = 16,715.14