Finding the Fourth Proportional to 12,215.48, 18,323.90 and 3,451.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,215.48 : 18,323.90 = 3,451.15 : x
2. Step 2: Convert to fraction form
   12,215.48/18,323.90 = 3,451.15/x
3. Step 3: Cross multiply
   12,215.48x = 18,323.90 × 3,451.15
4. Step 4: Simplify right side
   12,215.48x = 63,238,418.61
5. Step 5: Solve for x
   x = 63,238,418.61/12,215.48
6. Step 6: Final answer
   x = 5,176.91