Finding the Fourth Proportional to 21,179.92, 31,761.78 and 10,078.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,179.92 : 31,761.78 = 10,078.06 : x
2. Step 2: Convert to fraction form
   21,179.92/31,761.78 = 10,078.06/x
3. Step 3: Cross multiply
   21,179.92x = 31,761.78 × 10,078.06
4. Step 4: Simplify right side
   21,179.92x = 320,097,124.55
5. Step 5: Solve for x
   x = 320,097,124.55/21,179.92
6. Step 6: Final answer
   x = 15,113.24