Finding the Fourth Proportional to 12,270.37, 18,405.18 and 3,505.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,270.37 : 18,405.18 = 3,505.30 : x
2. Step 2: Convert to fraction form
   12,270.37/18,405.18 = 3,505.30/x
3. Step 3: Cross multiply
   12,270.37x = 18,405.18 × 3,505.30
4. Step 4: Simplify right side
   12,270.37x = 64,515,677.45
5. Step 5: Solve for x
   x = 64,515,677.45/12,270.37
6. Step 6: Final answer
   x = 5,257.84