Finding the Fourth Proportional to 12,339.31, 17,016.99 and 10,553.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,339.31 : 17,016.99 = 10,553.49 : x
2. Step 2: Convert to fraction form
   12,339.31/17,016.99 = 10,553.49/x
3. Step 3: Cross multiply
   12,339.31x = 17,016.99 × 10,553.49
4. Step 4: Simplify right side
   12,339.31x = 179,588,594.22
5. Step 5: Solve for x
   x = 179,588,594.22/12,339.31
6. Step 6: Final answer
   x = 14,554.18