Finding the Third Proportional to 61,279.88 and 128,172.38

Step by Step Solution

1. Step 1: Write the proportion equation
   61,279.88 : 128,172.38 = 128,172.38 : x
2. Step 2: Convert to fraction form
   61,279.88/128,172.38 = 128,172.38/x
3. Step 3: Cross multiply
   61,279.88x = 128,172.38 × 128,172.38
4. Step 4: Simplify right side
   61,279.88x = 16,428,157,713.14
5. Step 5: Solve for x
   x = 16,428,157,713.14/61,279.88
6. Step 6: Final answer
   x = 268,084.06