Finding the Fourth Proportional to 12,940.57, 17,857.90 and 7,351.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,940.57 : 17,857.90 = 7,351.57 : x
2. Step 2: Convert to fraction form
   12,940.57/17,857.90 = 7,351.57/x
3. Step 3: Cross multiply
   12,940.57x = 17,857.90 × 7,351.57
4. Step 4: Simplify right side
   12,940.57x = 131,283,601.90
5. Step 5: Solve for x
   x = 131,283,601.90/12,940.57
6. Step 6: Final answer
   x = 10,145.12