Finding the Fourth Proportional to 12,945.57, 17,864.79 and 7,356.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.57 : 17,864.79 = 7,356.57 : x
2. Step 2: Convert to fraction form
   12,945.57/17,864.79 = 7,356.57/x
3. Step 3: Cross multiply
   12,945.57x = 17,864.79 × 7,356.57
4. Step 4: Simplify right side
   12,945.57x = 131,423,578.17
5. Step 5: Solve for x
   x = 131,423,578.17/12,945.57
6. Step 6: Final answer
   x = 10,152.01