Finding the Third Proportional to 65,815.59 and 128,350.69

Step by Step Solution

1. Step 1: Write the proportion equation
   65,815.59 : 128,350.69 = 128,350.69 : x
2. Step 2: Convert to fraction form
   65,815.59/128,350.69 = 128,350.69/x
3. Step 3: Cross multiply
   65,815.59x = 128,350.69 × 128,350.69
4. Step 4: Simplify right side
   65,815.59x = 16,473,898,981.72
5. Step 5: Solve for x
   x = 16,473,898,981.72/65,815.59
6. Step 6: Final answer
   x = 250,303.89