Finding the Fourth Proportional to 12,940.17, 17,856.84 and 7,912.77

Step by Step Solution

1. Step 1: Write the proportion equation
   12,940.17 : 17,856.84 = 7,912.77 : x
2. Step 2: Convert to fraction form
   12,940.17/17,856.84 = 7,912.77/x
3. Step 3: Cross multiply
   12,940.17x = 17,856.84 × 7,912.77
4. Step 4: Simplify right side
   12,940.17x = 141,297,067.85
5. Step 5: Solve for x
   x = 141,297,067.85/12,940.17
6. Step 6: Final answer
   x = 10,919.26