Finding the Fourth Proportional to 12,942.94, 17,856.96 and 7,905.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,942.94 : 17,856.96 = 7,905.34 : x
2. Step 2: Convert to fraction form
   12,942.94/17,856.96 = 7,905.34/x
3. Step 3: Cross multiply
   12,942.94x = 17,856.96 × 7,905.34
4. Step 4: Simplify right side
   12,942.94x = 141,165,340.17
5. Step 5: Solve for x
   x = 141,165,340.17/12,942.94
6. Step 6: Final answer
   x = 10,906.74