Finding the Fourth Proportional to 21,829.02, 30,116.55 and 13,328.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,829.02 : 30,116.55 = 13,328.88 : x
2. Step 2: Convert to fraction form
   21,829.02/30,116.55 = 13,328.88/x
3. Step 3: Cross multiply
   21,829.02x = 30,116.55 × 13,328.88
4. Step 4: Simplify right side
   21,829.02x = 401,419,880.96
5. Step 5: Solve for x
   x = 401,419,880.96/21,829.02
6. Step 6: Final answer
   x = 18,389.28