Finding the Fourth Proportional to 10,685.21, 14,745.18 and 5,905.05

Step by Step Solution

1. Step 1: Write the proportion equation
   10,685.21 : 14,745.18 = 5,905.05 : x
2. Step 2: Convert to fraction form
   10,685.21/14,745.18 = 5,905.05/x
3. Step 3: Cross multiply
   10,685.21x = 14,745.18 × 5,905.05
4. Step 4: Simplify right side
   10,685.21x = 87,071,025.16
5. Step 5: Solve for x
   x = 87,071,025.16/10,685.21
6. Step 6: Final answer
   x = 8,148.75