Finding the Fourth Proportional to 17,127.48, 25,696.40 and 12,139.48

Step by Step Solution

1. Step 1: Write the proportion equation
   17,127.48 : 25,696.40 = 12,139.48 : x
2. Step 2: Convert to fraction form
   17,127.48/25,696.40 = 12,139.48/x
3. Step 3: Cross multiply
   17,127.48x = 25,696.40 × 12,139.48
4. Step 4: Simplify right side
   17,127.48x = 311,940,933.87
5. Step 5: Solve for x
   x = 311,940,933.87/17,127.48
6. Step 6: Final answer
   x = 18,212.89