Finding the Fourth Proportional to 21,276.60, 31,915.98 and 8,127.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,276.60 : 31,915.98 = 8,127.06 : x
2. Step 2: Convert to fraction form
   21,276.60/31,915.98 = 8,127.06/x
3. Step 3: Cross multiply
   21,276.60x = 31,915.98 × 8,127.06
4. Step 4: Simplify right side
   21,276.60x = 259,383,084.42
5. Step 5: Solve for x
   x = 259,383,084.42/21,276.60
6. Step 6: Final answer
   x = 12,191.00