Finding the Fourth Proportional to 12,945.22, 17,864.60 and 7,280.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.22 : 17,864.60 = 7,280.43 : x
2. Step 2: Convert to fraction form
   12,945.22/17,864.60 = 7,280.43/x
3. Step 3: Cross multiply
   12,945.22x = 17,864.60 × 7,280.43
4. Step 4: Simplify right side
   12,945.22x = 130,062,007.82
5. Step 5: Solve for x
   x = 130,062,007.82/12,945.22
6. Step 6: Final answer
   x = 10,047.11