Finding the Third Proportional to 31,290.50 and 65,170

Step by Step Solution

1. Step 1: Write the proportion equation
   31,290.50 : 65,170 = 65,170 : x
2. Step 2: Convert to fraction form
   31,290.50/65,170 = 65,170/x
3. Step 3: Cross multiply
   31,290.50x = 65,170 × 65,170
4. Step 4: Simplify right side
   31,290.50x = 4,247,128,900
5. Step 5: Solve for x
   x = 4,247,128,900/31,290.50
6. Step 6: Final answer
   x = 135,732.22