Finding the Third Proportional to 30,818.81 and 65,609.16

Step by Step Solution

1. Step 1: Write the proportion equation
   30,818.81 : 65,609.16 = 65,609.16 : x
2. Step 2: Convert to fraction form
   30,818.81/65,609.16 = 65,609.16/x
3. Step 3: Cross multiply
   30,818.81x = 65,609.16 × 65,609.16
4. Step 4: Simplify right side
   30,818.81x = 4,304,561,383.84
5. Step 5: Solve for x
   x = 4,304,561,383.84/30,818.81
6. Step 6: Final answer
   x = 139,673.17