Finding the Third Proportional to 61,185.38 and 129,721.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,185.38 : 129,721.50 = 129,721.50 : x
2. Step 2: Convert to fraction form
   61,185.38/129,721.50 = 129,721.50/x
3. Step 3: Cross multiply
   61,185.38x = 129,721.50 × 129,721.50
4. Step 4: Simplify right side
   61,185.38x = 16,827,667,562.25
5. Step 5: Solve for x
   x = 16,827,667,562.25/61,185.38
6. Step 6: Final answer
   x = 275,027.61