Finding the Third Proportional to 9,142.88 and 12,418.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,142.88 : 12,418.31 = 12,418.31 : x
2. Step 2: Convert to fraction form
   9,142.88/12,418.31 = 12,418.31/x
3. Step 3: Cross multiply
   9,142.88x = 12,418.31 × 12,418.31
4. Step 4: Simplify right side
   9,142.88x = 154,214,485.35
5. Step 5: Solve for x
   x = 154,214,485.35/9,142.88
6. Step 6: Final answer
   x = 16,867.18