Finding the Fourth Proportional to 10,215.05, 15,315.37 and 3,969.86

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215.05 : 15,315.37 = 3,969.86 : x
2. Step 2: Convert to fraction form
   10,215.05/15,315.37 = 3,969.86/x
3. Step 3: Cross multiply
   10,215.05x = 15,315.37 × 3,969.86
4. Step 4: Simplify right side
   10,215.05x = 60,799,874.75
5. Step 5: Solve for x
   x = 60,799,874.75/10,215.05
6. Step 6: Final answer
   x = 5,951.99