Finding the Fourth Proportional to 21,772.27, 30,048.50 and 12,820.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,772.27 : 30,048.50 = 12,820.60 : x
2. Step 2: Convert to fraction form
   21,772.27/30,048.50 = 12,820.60/x
3. Step 3: Cross multiply
   21,772.27x = 30,048.50 × 12,820.60
4. Step 4: Simplify right side
   21,772.27x = 385,239,799.10
5. Step 5: Solve for x
   x = 385,239,799.10/21,772.27
6. Step 6: Final answer
   x = 17,694.06