Finding the Fourth Proportional to 12,185.49, 18,278.16 and 3,420.41

Step by Step Solution

1. Step 1: Write the proportion equation
   12,185.49 : 18,278.16 = 3,420.41 : x
2. Step 2: Convert to fraction form
   12,185.49/18,278.16 = 3,420.41/x
3. Step 3: Cross multiply
   12,185.49x = 18,278.16 × 3,420.41
4. Step 4: Simplify right side
   12,185.49x = 62,518,801.25
5. Step 5: Solve for x
   x = 62,518,801.25/12,185.49
6. Step 6: Final answer
   x = 5,130.59