Finding the Fourth Proportional to 12,204.15, 18,297.72 and 5,621.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,204.15 : 18,297.72 = 5,621.28 : x
2. Step 2: Convert to fraction form
   12,204.15/18,297.72 = 5,621.28/x
3. Step 3: Cross multiply
   12,204.15x = 18,297.72 × 5,621.28
4. Step 4: Simplify right side
   12,204.15x = 102,856,607.48
5. Step 5: Solve for x
   x = 102,856,607.48/12,204.15
6. Step 6: Final answer
   x = 8,428.00