Finding the Third Proportional to 61,141.50 and 128,919

Step by Step Solution

1. Step 1: Write the proportion equation
   61,141.50 : 128,919 = 128,919 : x
2. Step 2: Convert to fraction form
   61,141.50/128,919 = 128,919/x
3. Step 3: Cross multiply
   61,141.50x = 128,919 × 128,919
4. Step 4: Simplify right side
   61,141.50x = 16,620,108,561
5. Step 5: Solve for x
   x = 16,620,108,561/61,141.50
6. Step 6: Final answer
   x = 271,830.24