Finding the Fourth Proportional to 12,939.88, 17,856.42 and 7,350.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,939.88 : 17,856.42 = 7,350.76 : x
2. Step 2: Convert to fraction form
   12,939.88/17,856.42 = 7,350.76/x
3. Step 3: Cross multiply
   12,939.88x = 17,856.42 × 7,350.76
4. Step 4: Simplify right side
   12,939.88x = 131,258,257.88
5. Step 5: Solve for x
   x = 131,258,257.88/12,939.88
6. Step 6: Final answer
   x = 10,143.70