Finding the Third Proportional to 30,568.50 and 64,815.75

Step by Step Solution

1. Step 1: Write the proportion equation
   30,568.50 : 64,815.75 = 64,815.75 : x
2. Step 2: Convert to fraction form
   30,568.50/64,815.75 = 64,815.75/x
3. Step 3: Cross multiply
   30,568.50x = 64,815.75 × 64,815.75
4. Step 4: Simplify right side
   30,568.50x = 4,201,081,448.06
5. Step 5: Solve for x
   x = 4,201,081,448.06/30,568.50
6. Step 6: Final answer
   x = 137,431.72