Finding the Fourth Proportional to 21,978.76, 32,981.10 and 8,137.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.76 : 32,981.10 = 8,137.48 : x
2. Step 2: Convert to fraction form
   21,978.76/32,981.10 = 8,137.48/x
3. Step 3: Cross multiply
   21,978.76x = 32,981.10 × 8,137.48
4. Step 4: Simplify right side
   21,978.76x = 268,383,041.63
5. Step 5: Solve for x
   x = 268,383,041.63/21,978.76
6. Step 6: Final answer
   x = 12,211.02