Finding the Third Proportional to 61,063.50 and 128,686.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,063.50 : 128,686.50 = 128,686.50 : x
2. Step 2: Convert to fraction form
   61,063.50/128,686.50 = 128,686.50/x
3. Step 3: Cross multiply
   61,063.50x = 128,686.50 × 128,686.50
4. Step 4: Simplify right side
   61,063.50x = 16,560,215,282.25
5. Step 5: Solve for x
   x = 16,560,215,282.25/61,063.50
6. Step 6: Final answer
   x = 271,196.63