Finding the Fourth Proportional to 12,684.78, 17,502.94 and 7,965.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,684.78 : 17,502.94 = 7,965.72 : x
2. Step 2: Convert to fraction form
   12,684.78/17,502.94 = 7,965.72/x
3. Step 3: Cross multiply
   12,684.78x = 17,502.94 × 7,965.72
4. Step 4: Simplify right side
   12,684.78x = 139,423,519.22
5. Step 5: Solve for x
   x = 139,423,519.22/12,684.78
6. Step 6: Final answer
   x = 10,991.40