Finding the Fourth Proportional to 12,643.52, 18,964.55 and 3,878.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,643.52 : 18,964.55 = 3,878.42 : x
2. Step 2: Convert to fraction form
   12,643.52/18,964.55 = 3,878.42/x
3. Step 3: Cross multiply
   12,643.52x = 18,964.55 × 3,878.42
4. Step 4: Simplify right side
   12,643.52x = 73,552,404.88
5. Step 5: Solve for x
   x = 73,552,404.88/12,643.52
6. Step 6: Final answer
   x = 5,817.40