Finding the Fourth Proportional to 12,939.57, 17,856.52 and 7,350.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,939.57 : 17,856.52 = 7,350.57 : x
2. Step 2: Convert to fraction form
   12,939.57/17,856.52 = 7,350.57/x
3. Step 3: Cross multiply
   12,939.57x = 17,856.52 × 7,350.57
4. Step 4: Simplify right side
   12,939.57x = 131,255,581.84
5. Step 5: Solve for x
   x = 131,255,581.84/12,939.57
6. Step 6: Final answer
   x = 10,143.74