Finding the Fourth Proportional to 12,813, 17,685.18 and 7,227.24

Step by Step Solution

1. Step 1: Write the proportion equation
   12,813 : 17,685.18 = 7,227.24 : x
2. Step 2: Convert to fraction form
   12,813/17,685.18 = 7,227.24/x
3. Step 3: Cross multiply
   12,813x = 17,685.18 × 7,227.24
4. Step 4: Simplify right side
   12,813x = 127,815,040.30
5. Step 5: Solve for x
   x = 127,815,040.30/12,813
6. Step 6: Final answer
   x = 9,975.42