Finding the Fourth Proportional to 12,212.10, 18,321.59 and 3,447.09

Step by Step Solution

1. Step 1: Write the proportion equation
   12,212.10 : 18,321.59 = 3,447.09 : x
2. Step 2: Convert to fraction form
   12,212.10/18,321.59 = 3,447.09/x
3. Step 3: Cross multiply
   12,212.10x = 18,321.59 × 3,447.09
4. Step 4: Simplify right side
   12,212.10x = 63,156,169.67
5. Step 5: Solve for x
   x = 63,156,169.67/12,212.10
6. Step 6: Final answer
   x = 5,171.61