Finding the Fourth Proportional to 12,215.16, 18,314.52 and 5,637.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,215.16 : 18,314.52 = 5,637.72 : x
2. Step 2: Convert to fraction form
   12,215.16/18,314.52 = 5,637.72/x
3. Step 3: Cross multiply
   12,215.16x = 18,314.52 × 5,637.72
4. Step 4: Simplify right side
   12,215.16x = 103,252,135.69
5. Step 5: Solve for x
   x = 103,252,135.69/12,215.16
6. Step 6: Final answer
   x = 8,452.79