Finding the Fourth Proportional to 12,218.31, 18,327.54 and 3,453.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,218.31 : 18,327.54 = 3,453.30 : x
2. Step 2: Convert to fraction form
   12,218.31/18,327.54 = 3,453.30/x
3. Step 3: Cross multiply
   12,218.31x = 18,327.54 × 3,453.30
4. Step 4: Simplify right side
   12,218.31x = 63,290,493.88
5. Step 5: Solve for x
   x = 63,290,493.88/12,218.31
6. Step 6: Final answer
   x = 5,179.97