Finding the Fourth Proportional to 12,198.32, 18,297.40 and 3,878.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,198.32 : 18,297.40 = 3,878.15 : x
2. Step 2: Convert to fraction form
   12,198.32/18,297.40 = 3,878.15/x
3. Step 3: Cross multiply
   12,198.32x = 18,297.40 × 3,878.15
4. Step 4: Simplify right side
   12,198.32x = 70,960,061.81
5. Step 5: Solve for x
   x = 70,960,061.81/12,198.32
6. Step 6: Final answer
   x = 5,817.20