Finding the Fourth Proportional to 12,198.86, 18,300 and 3,878

Step by Step Solution

1. Step 1: Write the proportion equation
   12,198.86 : 18,300 = 3,878 : x
2. Step 2: Convert to fraction form
   12,198.86/18,300 = 3,878/x
3. Step 3: Cross multiply
   12,198.86x = 18,300 × 3,878
4. Step 4: Simplify right side
   12,198.86x = 70,967,400
5. Step 5: Solve for x
   x = 70,967,400/12,198.86
6. Step 6: Final answer
   x = 5,817.54