Finding the Fourth Proportional to 12,388.56, 18,558.63 and 8,216.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,388.56 : 18,558.63 = 8,216.16 : x
2. Step 2: Convert to fraction form
   12,388.56/18,558.63 = 8,216.16/x
3. Step 3: Cross multiply
   12,388.56x = 18,558.63 × 8,216.16
4. Step 4: Simplify right side
   12,388.56x = 152,480,673.46
5. Step 5: Solve for x
   x = 152,480,673.46/12,388.56
6. Step 6: Final answer
   x = 12,308.18