Finding the Fourth Proportional to 12,162.16, 18,245.76 and 5,142.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,162.16 : 18,245.76 = 5,142.16 : x
2. Step 2: Convert to fraction form
   12,162.16/18,245.76 = 5,142.16/x
3. Step 3: Cross multiply
   12,162.16x = 18,245.76 × 5,142.16
4. Step 4: Simplify right side
   12,162.16x = 93,822,617.24
5. Step 5: Solve for x
   x = 93,822,617.24/12,162.16
6. Step 6: Final answer
   x = 7,714.31