Finding the Fourth Proportional to 16,640.96, 22,959 and 10,978.52

Step by Step Solution

1. Step 1: Write the proportion equation
   16,640.96 : 22,959 = 10,978.52 : x
2. Step 2: Convert to fraction form
   16,640.96/22,959 = 10,978.52/x
3. Step 3: Cross multiply
   16,640.96x = 22,959 × 10,978.52
4. Step 4: Simplify right side
   16,640.96x = 252,055,840.68
5. Step 5: Solve for x
   x = 252,055,840.68/16,640.96
6. Step 6: Final answer
   x = 15,146.71