Finding the Fourth Proportional to 10,224.05, 15,328.90 and 3,978.80

Step by Step Solution

1. Step 1: Write the proportion equation
   10,224.05 : 15,328.90 = 3,978.80 : x
2. Step 2: Convert to fraction form
   10,224.05/15,328.90 = 3,978.80/x
3. Step 3: Cross multiply
   10,224.05x = 15,328.90 × 3,978.80
4. Step 4: Simplify right side
   10,224.05x = 60,990,540.73
5. Step 5: Solve for x
   x = 60,990,540.73/10,224.05
6. Step 6: Final answer
   x = 5,965.40