Finding the Fourth Proportional to 10,810.72, 16,215.20 and 3,415.44

Step by Step Solution

1. Step 1: Write the proportion equation
   10,810.72 : 16,215.20 = 3,415.44 : x
2. Step 2: Convert to fraction form
   10,810.72/16,215.20 = 3,415.44/x
3. Step 3: Cross multiply
   10,810.72x = 16,215.20 × 3,415.44
4. Step 4: Simplify right side
   10,810.72x = 55,382,042.69
5. Step 5: Solve for x
   x = 55,382,042.69/10,810.72
6. Step 6: Final answer
   x = 5,122.88