Finding the Fourth Proportional to 12,111.61, 18,167.46 and 3,678.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.61 : 18,167.46 = 3,678.18 : x
2. Step 2: Convert to fraction form
   12,111.61/18,167.46 = 3,678.18/x
3. Step 3: Cross multiply
   12,111.61x = 18,167.46 × 3,678.18
4. Step 4: Simplify right side
   12,111.61x = 66,823,188.02
5. Step 5: Solve for x
   x = 66,823,188.02/12,111.61
6. Step 6: Final answer
   x = 5,517.28