Finding the Third Proportional to 61,087.50 and 128,736

Step by Step Solution

1. Step 1: Write the proportion equation
   61,087.50 : 128,736 = 128,736 : x
2. Step 2: Convert to fraction form
   61,087.50/128,736 = 128,736/x
3. Step 3: Cross multiply
   61,087.50x = 128,736 × 128,736
4. Step 4: Simplify right side
   61,087.50x = 16,572,957,696
5. Step 5: Solve for x
   x = 16,572,957,696/61,087.50
6. Step 6: Final answer
   x = 271,298.67