Finding the Fourth Proportional to 12,141.68, 18,215.70 and 3,821.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,141.68 : 18,215.70 = 3,821.50 : x
2. Step 2: Convert to fraction form
   12,141.68/18,215.70 = 3,821.50/x
3. Step 3: Cross multiply
   12,141.68x = 18,215.70 × 3,821.50
4. Step 4: Simplify right side
   12,141.68x = 69,611,297.55
5. Step 5: Solve for x
   x = 69,611,297.55/12,141.68
6. Step 6: Final answer
   x = 5,733.25