Finding the Fourth Proportional to 10,815.57, 16,225.79 and 3,420.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,815.57 : 16,225.79 = 3,420.50 : x
2. Step 2: Convert to fraction form
   10,815.57/16,225.79 = 3,420.50/x
3. Step 3: Cross multiply
   10,815.57x = 16,225.79 × 3,420.50
4. Step 4: Simplify right side
   10,815.57x = 55,500,216.46
5. Step 5: Solve for x
   x = 55,500,216.46/10,815.57
6. Step 6: Final answer
   x = 5,131.51