Finding the Fourth Proportional to 12,578.66, 18,870.71 and 3,814.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,578.66 : 18,870.71 = 3,814.22 : x
2. Step 2: Convert to fraction form
   12,578.66/18,870.71 = 3,814.22/x
3. Step 3: Cross multiply
   12,578.66x = 18,870.71 × 3,814.22
4. Step 4: Simplify right side
   12,578.66x = 71,977,039.50
5. Step 5: Solve for x
   x = 71,977,039.50/12,578.66
6. Step 6: Final answer
   x = 5,722.15