Finding the Third Proportional to 71,290.50 and 99,666

Step by Step Solution

1. Step 1: Write the proportion equation
   71,290.50 : 99,666 = 99,666 : x
2. Step 2: Convert to fraction form
   71,290.50/99,666 = 99,666/x
3. Step 3: Cross multiply
   71,290.50x = 99,666 × 99,666
4. Step 4: Simplify right side
   71,290.50x = 9,933,311,556
5. Step 5: Solve for x
   x = 9,933,311,556/71,290.50
6. Step 6: Final answer
   x = 139,335.70