Finding the Fourth Proportional to 10,815.91, 16,223.75 and 3,420.37

Step by Step Solution

1. Step 1: Write the proportion equation
   10,815.91 : 16,223.75 = 3,420.37 : x
2. Step 2: Convert to fraction form
   10,815.91/16,223.75 = 3,420.37/x
3. Step 3: Cross multiply
   10,815.91x = 16,223.75 × 3,420.37
4. Step 4: Simplify right side
   10,815.91x = 55,491,227.79
5. Step 5: Solve for x
   x = 55,491,227.79/10,815.91
6. Step 6: Final answer
   x = 5,130.52