Finding the Third Proportional to 61,022.25 and 128,605.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,022.25 : 128,605.50 = 128,605.50 : x
2. Step 2: Convert to fraction form
   61,022.25/128,605.50 = 128,605.50/x
3. Step 3: Cross multiply
   61,022.25x = 128,605.50 × 128,605.50
4. Step 4: Simplify right side
   61,022.25x = 16,539,374,630.25
5. Step 5: Solve for x
   x = 16,539,374,630.25/61,022.25
6. Step 6: Final answer
   x = 271,038.43