Finding the Fourth Proportional to 12,425.31, 18,638.55 and 3,660.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,425.31 : 18,638.55 = 3,660.30 : x
2. Step 2: Convert to fraction form
   12,425.31/18,638.55 = 3,660.30/x
3. Step 3: Cross multiply
   12,425.31x = 18,638.55 × 3,660.30
4. Step 4: Simplify right side
   12,425.31x = 68,222,684.57
5. Step 5: Solve for x
   x = 68,222,684.57/12,425.31
6. Step 6: Final answer
   x = 5,490.62