Finding the Fourth Proportional to 10,685.28, 14,745.61 and 5,905.55

Step by Step Solution

1. Step 1: Write the proportion equation
   10,685.28 : 14,745.61 = 5,905.55 : x
2. Step 2: Convert to fraction form
   10,685.28/14,745.61 = 5,905.55/x
3. Step 3: Cross multiply
   10,685.28x = 14,745.61 × 5,905.55
4. Step 4: Simplify right side
   10,685.28x = 87,080,939.91
5. Step 5: Solve for x
   x = 87,080,939.91/10,685.28
6. Step 6: Final answer
   x = 8,149.61