Finding the Fourth Proportional to 12,722.82, 17,558.18 and 7,686.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,722.82 : 17,558.18 = 7,686.98 : x
2. Step 2: Convert to fraction form
   12,722.82/17,558.18 = 7,686.98/x
3. Step 3: Cross multiply
   12,722.82x = 17,558.18 × 7,686.98
4. Step 4: Simplify right side
   12,722.82x = 134,969,383.96
5. Step 5: Solve for x
   x = 134,969,383.96/12,722.82
6. Step 6: Final answer
   x = 10,608.45