Finding the Fourth Proportional to 12,105.68, 16,708.56 and 7,911.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,105.68 : 16,708.56 = 7,911.56 : x
2. Step 2: Convert to fraction form
   12,105.68/16,708.56 = 7,911.56/x
3. Step 3: Cross multiply
   12,105.68x = 16,708.56 × 7,911.56
4. Step 4: Simplify right side
   12,105.68x = 132,190,774.95
5. Step 5: Solve for x
   x = 132,190,774.95/12,105.68
6. Step 6: Final answer
   x = 10,919.73