Finding the Fourth Proportional to 12,199.47, 18,297.31 and 3,878.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,199.47 : 18,297.31 = 3,878.40 : x
2. Step 2: Convert to fraction form
   12,199.47/18,297.31 = 3,878.40/x
3. Step 3: Cross multiply
   12,199.47x = 18,297.31 × 3,878.40
4. Step 4: Simplify right side
   12,199.47x = 70,964,287.10
5. Step 5: Solve for x
   x = 70,964,287.10/12,199.47
6. Step 6: Final answer
   x = 5,817.00