Finding the Fourth Proportional to 12,897.90, 17,665.71 and 12,141.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,897.90 : 17,665.71 = 12,141.36 : x
2. Step 2: Convert to fraction form
   12,897.90/17,665.71 = 12,141.36/x
3. Step 3: Cross multiply
   12,897.90x = 17,665.71 × 12,141.36
4. Step 4: Simplify right side
   12,897.90x = 214,485,744.77
5. Step 5: Solve for x
   x = 214,485,744.77/12,897.90
6. Step 6: Final answer
   x = 16,629.51