Finding the Fourth Proportional to 10,660.16, 15,978.24 and 5,105.84

Step by Step Solution

1. Step 1: Write the proportion equation
   10,660.16 : 15,978.24 = 5,105.84 : x
2. Step 2: Convert to fraction form
   10,660.16/15,978.24 = 5,105.84/x
3. Step 3: Cross multiply
   10,660.16x = 15,978.24 × 5,105.84
4. Step 4: Simplify right side
   10,660.16x = 81,582,336.92
5. Step 5: Solve for x
   x = 81,582,336.92/10,660.16
6. Step 6: Final answer
   x = 7,653.01