Finding the Fourth Proportional to 21,729.53, 32,608.90 and 7,689.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,729.53 : 32,608.90 = 7,689.50 : x
2. Step 2: Convert to fraction form
   21,729.53/32,608.90 = 7,689.50/x
3. Step 3: Cross multiply
   21,729.53x = 32,608.90 × 7,689.50
4. Step 4: Simplify right side
   21,729.53x = 250,745,935.06
5. Step 5: Solve for x
   x = 250,745,935.06/21,729.53
6. Step 6: Final answer
   x = 11,539.41