Finding the Third Proportional to 30,259.20 and 64,636.10

Step by Step Solution

1. Step 1: Write the proportion equation
   30,259.20 : 64,636.10 = 64,636.10 : x
2. Step 2: Convert to fraction form
   30,259.20/64,636.10 = 64,636.10/x
3. Step 3: Cross multiply
   30,259.20x = 64,636.10 × 64,636.10
4. Step 4: Simplify right side
   30,259.20x = 4,177,825,625.20
5. Step 5: Solve for x
   x = 4,177,825,625.20/30,259.20
6. Step 6: Final answer
   x = 138,067.97