Finding the Fourth Proportional to 21,732.48, 29,990.56 and 12,300.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,732.48 : 29,990.56 = 12,300.80 : x
2. Step 2: Convert to fraction form
   21,732.48/29,990.56 = 12,300.80/x
3. Step 3: Cross multiply
   21,732.48x = 29,990.56 × 12,300.80
4. Step 4: Simplify right side
   21,732.48x = 368,907,880.45
5. Step 5: Solve for x
   x = 368,907,880.45/21,732.48
6. Step 6: Final answer
   x = 16,974.96