Finding the Third Proportional to 61,699.50 and 128,065.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,699.50 : 128,065.50 = 128,065.50 : x
2. Step 2: Convert to fraction form
   61,699.50/128,065.50 = 128,065.50/x
3. Step 3: Cross multiply
   61,699.50x = 128,065.50 × 128,065.50
4. Step 4: Simplify right side
   61,699.50x = 16,400,772,290.25
5. Step 5: Solve for x
   x = 16,400,772,290.25/61,699.50
6. Step 6: Final answer
   x = 265,816.94