Finding the Fourth Proportional to 21,782.52, 32,621.15 and 12,394.09

Step by Step Solution

1. Step 1: Write the proportion equation
   21,782.52 : 32,621.15 = 12,394.09 : x
2. Step 2: Convert to fraction form
   21,782.52/32,621.15 = 12,394.09/x
3. Step 3: Cross multiply
   21,782.52x = 32,621.15 × 12,394.09
4. Step 4: Simplify right side
   21,782.52x = 404,309,562.80
5. Step 5: Solve for x
   x = 404,309,562.80/21,782.52
6. Step 6: Final answer
   x = 18,561.20