Finding the Third Proportional to 53,939.25 and 81,661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   53,939.25 : 81,661.50 = 81,661.50 : x
2. Step 2: Convert to fraction form
   53,939.25/81,661.50 = 81,661.50/x
3. Step 3: Cross multiply
   53,939.25x = 81,661.50 × 81,661.50
4. Step 4: Simplify right side
   53,939.25x = 6,668,600,582.25
5. Step 5: Solve for x
   x = 6,668,600,582.25/53,939.25
6. Step 6: Final answer
   x = 123,631.69