Finding the Fourth Proportional to 12,815.72, 17,686.50 and 7,227.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,815.72 : 17,686.50 = 7,227.08 : x
2. Step 2: Convert to fraction form
   12,815.72/17,686.50 = 7,227.08/x
3. Step 3: Cross multiply
   12,815.72x = 17,686.50 × 7,227.08
4. Step 4: Simplify right side
   12,815.72x = 127,821,750.42
5. Step 5: Solve for x
   x = 127,821,750.42/12,815.72
6. Step 6: Final answer
   x = 9,973.83