Finding the Fourth Proportional to 10,978.63, 16,468.19 and 3,959.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.63 : 16,468.19 = 3,959.21 : x
2. Step 2: Convert to fraction form
   10,978.63/16,468.19 = 3,959.21/x
3. Step 3: Cross multiply
   10,978.63x = 16,468.19 × 3,959.21
4. Step 4: Simplify right side
   10,978.63x = 65,201,022.53
5. Step 5: Solve for x
   x = 65,201,022.53/10,978.63
6. Step 6: Final answer
   x = 5,938.90