Finding the Third Proportional to 8,142 and 12,281.25

Step by Step Solution

1. Step 1: Write the proportion equation
   8,142 : 12,281.25 = 12,281.25 : x
2. Step 2: Convert to fraction form
   8,142/12,281.25 = 12,281.25/x
3. Step 3: Cross multiply
   8,142x = 12,281.25 × 12,281.25
4. Step 4: Simplify right side
   8,142x = 150,829,101.56
5. Step 5: Solve for x
   x = 150,829,101.56/8,142
6. Step 6: Final answer
   x = 18,524.82