Finding the Fourth Proportional to 12,813.56, 17,682.72 and 7,224.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,813.56 : 17,682.72 = 7,224.56 : x
2. Step 2: Convert to fraction form
   12,813.56/17,682.72 = 7,224.56/x
3. Step 3: Cross multiply
   12,813.56x = 17,682.72 × 7,224.56
4. Step 4: Simplify right side
   12,813.56x = 127,749,915.81
5. Step 5: Solve for x
   x = 127,749,915.81/12,813.56
6. Step 6: Final answer
   x = 9,969.90