Finding the Fourth Proportional to 12,993.72, 17,930.90 and 7,328.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,993.72 : 17,930.90 = 7,328.61 : x
2. Step 2: Convert to fraction form
   12,993.72/17,930.90 = 7,328.61/x
3. Step 3: Cross multiply
   12,993.72x = 17,930.90 × 7,328.61
4. Step 4: Simplify right side
   12,993.72x = 131,408,591.37
5. Step 5: Solve for x
   x = 131,408,591.37/12,993.72
6. Step 6: Final answer
   x = 10,113.24