Finding the Fourth Proportional to 12,939.50, 17,856.51 and 7,350.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,939.50 : 17,856.51 = 7,350.50 : x
2. Step 2: Convert to fraction form
   12,939.50/17,856.51 = 7,350.50/x
3. Step 3: Cross multiply
   12,939.50x = 17,856.51 × 7,350.50
4. Step 4: Simplify right side
   12,939.50x = 131,254,276.76
5. Step 5: Solve for x
   x = 131,254,276.76/12,939.50
6. Step 6: Final answer
   x = 10,143.69