Finding the Third Proportional to 61,072.50 and 128,706

Step by Step Solution

1. Step 1: Write the proportion equation
   61,072.50 : 128,706 = 128,706 : x
2. Step 2: Convert to fraction form
   61,072.50/128,706 = 128,706/x
3. Step 3: Cross multiply
   61,072.50x = 128,706 × 128,706
4. Step 4: Simplify right side
   61,072.50x = 16,565,234,436
5. Step 5: Solve for x
   x = 16,565,234,436/61,072.50
6. Step 6: Final answer
   x = 271,238.85