Finding the Third Proportional to 65,837.25 and 128,389.50

Step by Step Solution

1. Step 1: Write the proportion equation
   65,837.25 : 128,389.50 = 128,389.50 : x
2. Step 2: Convert to fraction form
   65,837.25/128,389.50 = 128,389.50/x
3. Step 3: Cross multiply
   65,837.25x = 128,389.50 × 128,389.50
4. Step 4: Simplify right side
   65,837.25x = 16,483,863,710.25
5. Step 5: Solve for x
   x = 16,483,863,710.25/65,837.25
6. Step 6: Final answer
   x = 250,372.91