Finding the Fourth Proportional to 12,443.16, 18,664.78 and 8,535.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,443.16 : 18,664.78 = 8,535.72 : x
2. Step 2: Convert to fraction form
   12,443.16/18,664.78 = 8,535.72/x
3. Step 3: Cross multiply
   12,443.16x = 18,664.78 × 8,535.72
4. Step 4: Simplify right side
   12,443.16x = 159,317,335.94
5. Step 5: Solve for x
   x = 159,317,335.94/12,443.16
6. Step 6: Final answer
   x = 12,803.61