Finding the Fourth Proportional to 12,144.64, 18,219.52 and 3,936

Step by Step Solution

1. Step 1: Write the proportion equation
   12,144.64 : 18,219.52 = 3,936 : x
2. Step 2: Convert to fraction form
   12,144.64/18,219.52 = 3,936/x
3. Step 3: Cross multiply
   12,144.64x = 18,219.52 × 3,936
4. Step 4: Simplify right side
   12,144.64x = 71,712,030.72
5. Step 5: Solve for x
   x = 71,712,030.72/12,144.64
6. Step 6: Final answer
   x = 5,904.83