Finding the Fourth Proportional to 21,643.59, 29,868.93 and 12,568.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,643.59 : 29,868.93 = 12,568.28 : x
2. Step 2: Convert to fraction form
   21,643.59/29,868.93 = 12,568.28/x
3. Step 3: Cross multiply
   21,643.59x = 29,868.93 × 12,568.28
4. Step 4: Simplify right side
   21,643.59x = 375,401,150.21
5. Step 5: Solve for x
   x = 375,401,150.21/21,643.59
6. Step 6: Final answer
   x = 17,344.68