Finding the Fourth Proportional to 21,665.48, 32,504.49 and 10,578.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,665.48 : 32,504.49 = 10,578.60 : x
2. Step 2: Convert to fraction form
   21,665.48/32,504.49 = 10,578.60/x
3. Step 3: Cross multiply
   21,665.48x = 32,504.49 × 10,578.60
4. Step 4: Simplify right side
   21,665.48x = 343,851,997.91
5. Step 5: Solve for x
   x = 343,851,997.91/21,665.48
6. Step 6: Final answer
   x = 15,870.97