Finding the Fourth Proportional to 12,215.88, 18,326.52 and 4,425.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,215.88 : 18,326.52 = 4,425.30 : x
2. Step 2: Convert to fraction form
   12,215.88/18,326.52 = 4,425.30/x
3. Step 3: Cross multiply
   12,215.88x = 18,326.52 × 4,425.30
4. Step 4: Simplify right side
   12,215.88x = 81,100,348.96
5. Step 5: Solve for x
   x = 81,100,348.96/12,215.88
6. Step 6: Final answer
   x = 6,638.93