Finding the Fourth Proportional to 12,960.31, 17,886.45 and 7,371.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,960.31 : 17,886.45 = 7,371.31 : x
2. Step 2: Convert to fraction form
   12,960.31/17,886.45 = 7,371.31/x
3. Step 3: Cross multiply
   12,960.31x = 17,886.45 × 7,371.31
4. Step 4: Simplify right side
   12,960.31x = 131,846,567.75
5. Step 5: Solve for x
   x = 131,846,567.75/12,960.31
6. Step 6: Final answer
   x = 10,173.10