Finding the Fourth Proportional to 10,212.28, 15,311.21 and 3,967.09

Step by Step Solution

1. Step 1: Write the proportion equation
   10,212.28 : 15,311.21 = 3,967.09 : x
2. Step 2: Convert to fraction form
   10,212.28/15,311.21 = 3,967.09/x
3. Step 3: Cross multiply
   10,212.28x = 15,311.21 × 3,967.09
4. Step 4: Simplify right side
   10,212.28x = 60,740,851.69
5. Step 5: Solve for x
   x = 60,740,851.69/10,212.28
6. Step 6: Final answer
   x = 5,947.83