Finding the Fourth Proportional to 10,218.28, 15,328.38 and 3,978.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,218.28 : 15,328.38 = 3,978.76 : x
2. Step 2: Convert to fraction form
   10,218.28/15,328.38 = 3,978.76/x
3. Step 3: Cross multiply
   10,218.28x = 15,328.38 × 3,978.76
4. Step 4: Simplify right side
   10,218.28x = 60,987,945.21
5. Step 5: Solve for x
   x = 60,987,945.21/10,218.28
6. Step 6: Final answer
   x = 5,968.51