Finding the Fourth Proportional to 10,814.31, 16,215.39 and 3,420.63

Step by Step Solution

1. Step 1: Write the proportion equation
   10,814.31 : 16,215.39 = 3,420.63 : x
2. Step 2: Convert to fraction form
   10,814.31/16,215.39 = 3,420.63/x
3. Step 3: Cross multiply
   10,814.31x = 16,215.39 × 3,420.63
4. Step 4: Simplify right side
   10,814.31x = 55,466,849.50
5. Step 5: Solve for x
   x = 55,466,849.50/10,814.31
6. Step 6: Final answer
   x = 5,129.02