Finding the Fourth Proportional to 12,722.05, 17,556.61 and 7,685.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,722.05 : 17,556.61 = 7,685.57 : x
2. Step 2: Convert to fraction form
   12,722.05/17,556.61 = 7,685.57/x
3. Step 3: Cross multiply
   12,722.05x = 17,556.61 × 7,685.57
4. Step 4: Simplify right side
   12,722.05x = 134,932,555.12
5. Step 5: Solve for x
   x = 134,932,555.12/12,722.05
6. Step 6: Final answer
   x = 10,606.20