Finding the Fourth Proportional to 21,123.36, 29,141.10 and 12,735

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123.36 : 29,141.10 = 12,735 : x
2. Step 2: Convert to fraction form
   21,123.36/29,141.10 = 12,735/x
3. Step 3: Cross multiply
   21,123.36x = 29,141.10 × 12,735
4. Step 4: Simplify right side
   21,123.36x = 371,111,908.50
5. Step 5: Solve for x
   x = 371,111,908.50/21,123.36
6. Step 6: Final answer
   x = 17,568.79