Finding the Third Proportional to 30,720.38 and 65,158.88

Step by Step Solution

1. Step 1: Write the proportion equation
   30,720.38 : 65,158.88 = 65,158.88 : x
2. Step 2: Convert to fraction form
   30,720.38/65,158.88 = 65,158.88/x
3. Step 3: Cross multiply
   30,720.38x = 65,158.88 × 65,158.88
4. Step 4: Simplify right side
   30,720.38x = 4,245,678,991.27
5. Step 5: Solve for x
   x = 4,245,678,991.27/30,720.38
6. Step 6: Final answer
   x = 138,204.01