Finding the Third Proportional to 8,142 and 12,300.75

Step by Step Solution

1. Step 1: Write the proportion equation
   8,142 : 12,300.75 = 12,300.75 : x
2. Step 2: Convert to fraction form
   8,142/12,300.75 = 12,300.75/x
3. Step 3: Cross multiply
   8,142x = 12,300.75 × 12,300.75
4. Step 4: Simplify right side
   8,142x = 151,308,450.56
5. Step 5: Solve for x
   x = 151,308,450.56/8,142
6. Step 6: Final answer
   x = 18,583.70