Finding the Fourth Proportional to 21,724.16, 32,588.82 and 7,681.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,724.16 : 32,588.82 = 7,681.28 : x
2. Step 2: Convert to fraction form
   21,724.16/32,588.82 = 7,681.28/x
3. Step 3: Cross multiply
   21,724.16x = 32,588.82 × 7,681.28
4. Step 4: Simplify right side
   21,724.16x = 250,323,851.29
5. Step 5: Solve for x
   x = 250,323,851.29/21,724.16
6. Step 6: Final answer
   x = 11,522.83